"Unknown value '10.11' of --mmacosx-version-min"

[luizfonseca]

Guys, I'm trying to install the psycopg2 on a project, from a requirements.txt file and this error (Unknown value...) is preventing the installation.

• I am using the Postgresql.app
• Virtualenv
• El Capitan 10.11.4

Here's the stack trace:

running build_ext
    building 'psycopg2._psycopg' extension
    creating build/temp.macosx-10.11-x86_64-2.7
    creating build/temp.macosx-10.11-x86_64-2.7/psycopg
    /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.6.1 (dt dec pq3 ext lo64)" -DPG_VERSION_HEX=0x090404 -DHAVE_LO64=1 -I/usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I. -I/Applications/Postgres.app/Contents/Versions/9.4/include -I/Applications/Postgres.app/Contents/Versions/9.4/include/postgresql/server -c psycopg/psycopgmodule.c -o build/temp.macosx-10.11-x86_64-2.7/psycopg/psycopgmodule.o
    <built-in>:0: error: Unknown value ‘10.11’ of -mmacosx-version-min
    In file included from /usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/include/python2.7/Python.h:85,
                     from ./psycopg/psycopg.h:30,
                     from psycopg/psycopgmodule.c:27:
    /usr/local/Cellar/python/2.7.10_2/Frameworks/Python.framework/Versions/2.7/include/python2.7/unicodeobject.h:4:20: error: stdarg.h: No such file or directory
    error: command '/usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2' failed with exit status 1

[dvarrazzo]

I don't see -mmacosx-version-min passed as argument by setup.py to the compiler. It seems an issue with your build system, of which I don't know anything about.