Fixes <https://bugs.gnu.org/30756>. Initially reported by Julien Lepiller <julien@lepiller.eu>. * gnu/packages/base.scm (make-gcc-libc): Remove 'treat-glibc-as-system-header' phase from 'arguments'. * gnu/packages/commencement.scm (gcc-final): Likewise. * gnu/packages/gcc.scm (gcc-4.7)[arguments]: Add "include/c++" to 'CPLUS_INCLUDE_PATH'. (gcc-6)[native-search-paths]: Remove. * gnu/packages/make-bootstrap.scm (gcc-for-bootstrap): Remove 'native-search-paths' and 'arguments'. * gnu/packages/patches/python-2.7-search-paths.patch, gnu/packages/patches/python-3-search-paths.patch: Replace "CPATH" with "C_INCLUDE_PATH". * guix/build-system/cmake.scm (lower): When not cross-compiling, move INPUTS from the 'host-inputs' field to the 'build-inputs' field of the bag, right after NATIVE-INPUTS. * guix/build-system/glib-or-gtk.scm (lower): Likewise. * guix/build-system/gnu.scm (lower): Likewise. * guix/build-system/meson.scm (lower): Likewise.
		
			
				
	
	
		
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Make sure the build system honors C_INCLUDE_PATH and LIBRARY_PATH when
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looking for headers and libraries.
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--- Python-2.7.10/setup.py	2015-10-07 18:33:18.125153186 +0200
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+++ Python-2.7.10/setup.py	2015-10-07 18:33:47.497347552 +0200
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@@ -526,6 +526,14 @@ class PyBuildExt(build_ext):
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             inc_dirs += ['/system/include', '/atheos/autolnk/include']
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             inc_dirs += os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
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+        # Always honor these variables.
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+        if not cross_compiling:
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+            lib_dirs += os.getenv('LIBRARY_PATH', '').split(os.pathsep)
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+            inc_dirs += os.getenv('C_INCLUDE_PATH', '').split(os.pathsep)
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+        else:
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+            lib_dirs = os.getenv('CROSS_LIBRARY_PATH', '').split(os.pathsep)
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+            inc_dirs = os.getenv('CROSS_CPATH', '').split(os.pathsep)
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+
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         # OSF/1 and Unixware have some stuff in /usr/ccs/lib (like -ldb)
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         if host_platform in ['osf1', 'unixware7', 'openunix8']:
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             lib_dirs += ['/usr/ccs/lib']
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