pip install psycopg2 broken - warning: unused function 'Dprintf' [duplicate]

Question

I can't seem to get pip to install psycopg2 in a latest project virtualenv (on macOS seirra with brew installed python) The error is:

creating build/temp.macosx-10.11-x86_64-3.5/psycopg
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/psycopgmodule.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/psycopgmodule.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/green.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/green.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/pqpath.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/pqpath.o
    psycopg/pqpath.c:198:17: warning: implicit conversion from enumeration type 'ConnStatusType' to different enumeration type 'ExecStatusType' [-Wenum-conversion]
                    PQstatus(conn->pgconn) : PQresultStatus(*pgres)));
                    ^~~~~~~~~~~~~~~~~~~~~~
    psycopg/pqpath.c:666:14: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
        if (size >= sizeof(query)) {
            ~~~~ ^  ~~~~~~~~~~~~~
    psycopg/pqpath.c:731:14: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
        if (size >= sizeof(query)) {
            ~~~~ ^  ~~~~~~~~~~~~~
    psycopg/pqpath.c:1628:17: warning: implicit conversion from enumeration type 'ConnStatusType' to different enumeration type 'ExecStatusType' [-Wenum-conversion]
                    PQstatus(curs->conn->pgconn) : PQresultStatus(curs->pgres)));
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
    4 warnings generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/utils.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/utils.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/bytes_format.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/bytes_format.o
    In file included from psycopg/bytes_format.c:81:
    In file included from ./psycopg/psycopg.h:33:
    ./psycopg/config.h:71:13: warning: unused function 'Dprintf' [-Wunused-function]
    static void Dprintf(const char *fmt, ...) {}
                ^
    1 warning generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/connection_int.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/connection_int.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/connection_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/connection_type.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/cursor_int.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/cursor_int.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/cursor_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/cursor_type.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/diagnostics_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/diagnostics_type.o
    In file included from psycopg/diagnostics_type.c:27:
    In file included from ./psycopg/psycopg.h:33:
    ./psycopg/config.h:71:13: warning: unused function 'Dprintf' [-Wunused-function]
    static void Dprintf(const char *fmt, ...) {}
                ^
    1 warning generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/error_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/error_type.o
    In file included from psycopg/error_type.c:27:
    In file included from ./psycopg/psycopg.h:33:
    ./psycopg/config.h:71:13: warning: unused function 'Dprintf' [-Wunused-function]
    static void Dprintf(const char *fmt, ...) {}
                ^
    1 warning generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/lobject_int.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/lobject_int.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/lobject_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/lobject_type.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/notify_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/notify_type.o
    In file included from psycopg/notify_type.c:27:
    In file included from ./psycopg/psycopg.h:33:
    ./psycopg/config.h:71:13: warning: unused function 'Dprintf' [-Wunused-function]
    static void Dprintf(const char *fmt, ...) {}
                ^
    1 warning generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/xid_type.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/xid_type.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_asis.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_asis.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_binary.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_binary.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_datetime.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_datetime.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_list.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_list.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_pboolean.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pboolean.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_pdecimal.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pdecimal.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_pint.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pint.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_pfloat.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pfloat.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/adapter_qstring.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_qstring.o
    psycopg/adapter_qstring.c:98:14: warning: comparison of integers of different signs: 'Py_ssize_t' (aka 'long') and 'size_t' (aka 'unsigned long') [-Wsign-compare]
        if (qlen > (size_t) PY_SSIZE_T_MAX) {
            ~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~
    1 warning generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/microprotocols.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/microprotocols.o
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/microprotocols_proto.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/microprotocols_proto.o
    In file included from psycopg/microprotocols_proto.c:27:
    In file included from ./psycopg/psycopg.h:33:
    ./psycopg/config.h:71:13: warning: unused function 'Dprintf' [-Wunused-function]
    static void Dprintf(const char *fmt, ...) {}
                ^
    1 warning generated.
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.2 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090500 -DHAVE_LO64=1 -I/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/include/python3.5m -I. -I/usr/local/Cellar/postgresql/9.5.0/include -I/usr/local/Cellar/postgresql/9.5.0/include/server -c psycopg/typecast.c -o build/temp.macosx-10.11-x86_64-3.5/psycopg/typecast.o
    psycopg/typecast.c:494:5: warning: incompatible pointer types initializing 'PyAsyncMethods *' with an expression of type 'int (PyObject *, PyObject *)' (aka 'int (struct _object *, struct _object *)') [-Wincompatible-pointer-types]
        typecast_cmp, /*tp_compare*/
        ^~~~~~~~~~~~
    1 warning generated.
    clang -bundle -undefined dynamic_lookup build/temp.macosx-10.11-x86_64-3.5/psycopg/psycopgmodule.o build/temp.macosx-10.11-x86_64-3.5/psycopg/green.o build/temp.macosx-10.11-x86_64-3.5/psycopg/pqpath.o build/temp.macosx-10.11-x86_64-3.5/psycopg/utils.o build/temp.macosx-10.11-x86_64-3.5/psycopg/bytes_format.o build/temp.macosx-10.11-x86_64-3.5/psycopg/connection_int.o build/temp.macosx-10.11-x86_64-3.5/psycopg/connection_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/cursor_int.o build/temp.macosx-10.11-x86_64-3.5/psycopg/cursor_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/diagnostics_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/error_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/lobject_int.o build/temp.macosx-10.11-x86_64-3.5/psycopg/lobject_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/notify_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/xid_type.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_asis.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_binary.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_datetime.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_list.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pboolean.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pdecimal.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pint.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_pfloat.o build/temp.macosx-10.11-x86_64-3.5/psycopg/adapter_qstring.o build/temp.macosx-10.11-x86_64-3.5/psycopg/microprotocols.o build/temp.macosx-10.11-x86_64-3.5/psycopg/microprotocols_proto.o build/temp.macosx-10.11-x86_64-3.5/psycopg/typecast.o -L/usr/local/lib -lpq -lssl -lcrypto -o build/lib.macosx-10.11-x86_64-3.5/psycopg2/_psycopg.cpython-35m-darwin.so
    ld: library not found for -lssl
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command 'clang' failed with exit status 1

    ----------------------------------------
Command "/Users/Barclay/.virtualenvs/switcher52/bin/python3.5 -u -c "import setuptools, tokenize;__file__='/private/var/folders/bg/khxkyq75109cbmxt7n1vb0qc0000gn/T/pip-build-gll0mv8c/psycopg2/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/bg/khxkyq75109cbmxt7n1vb0qc0000gn/T/pip-u44_rti6-record/install-record.txt --single-version-externally-managed --compile --install-headers /Users/Barclay/.virtualenvs/switcher52/bin/../include/site/python3.5/psycopg2" failed with error code 1 in /private/var/folders/bg/khxkyq75109cbmxt7n1vb0qc0000gn/T/pip-build-gll0mv8c/psycopg2/

Answer 1

The warning says nothing, the problem is: ld: library not found for -lssl. which means that you should install openssl first. on homebrew this could be as easy as brew install openssl

Answer 2

Error is here:

ld: library not found for -lssl

So you probably have to install ssl library.