Unable to set PYTHON_INCLUDE_DIR with cmake.

[rheniser]

I am unable to set PYTHON_INCLUDE_DIR. I tried setting both PYTHON_INCLUDE_PATH and
PYTHON_INCLUDE_DIRS. Neither of them worked.

When I hardcode PYTHON_INCLUDE_DIR in CMakeLists.txt or pass with CXXFLAGS it works. But, I get warnings because the python include directory needs to be first (see https://stackoverflow.com/questions/10056393/g-with-python-h-how-to-compile)

[  1%] Building CXX object CMakeFiles/nanogui-python-obj.dir/python/main.cpp.o
...
warning: "_POSIX_C_SOURCE" redefined [enabled by default]
 #define _POSIX_C_SOURCE 200112L
 ^
In file included from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/os_defines.h:39:0,
                 from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/c++config.h:2097,
                 from /usr/include/c++/4.8.2/type_traits:38,
                 from /usr/include/c++/4.8.2/ratio:38,
                 from /usr/include/c++/4.8.2/chrono:38,
                 from /usr/include/c++/4.8.2/thread:38,
                 from 
...
warning: "_XOPEN_SOURCE" redefined [enabled by default]
 #define _XOPEN_SOURCE 600
 ^
In file included from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/os_defines.h:39:0,
                 from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/c++config.h:2097,
                 from /usr/include/c++/4.8.2/type_traits:38,
                 from /usr/include/c++/4.8.2/ratio:38,
                 from /usr/include/c++/4.8.2/chrono:38,
                 from /usr/include/c++/4.8.2/thread:38,
                 from /src/rheniser/git/bfd/ext/materialx/build/linux_x64_gcc48_release/nanogui/python/main.cpp:3:
/usr/include/features.h:170:0: note: this is the location of the previous definition
 # define _XOPEN_SOURCE 700
 ^

[svenevs]

Hmm. How peculiar! I'd like to try and reproduce this in a docker image of possible. This ultimately is coming from a relatively old glibc, yes? What distro are you using?

[rheniser]

CentOS Linux release 7.4.1708 (Core)
Linux 3.10.0-957.21.2.el7.x86_64 x86_64
GNU C Library (GNU libc) stable release version 2.17, by Roland McGrath et al.