libpng: CPPFLAGS for -I (#6563)
Recent versions of `libpng` (e.g. 1.6.34) warn/abort that includes for `zlib` need to be passed properly via `CPPFLAGS`. This fixes it.
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@ -57,7 +57,7 @@ def configure_args(self):
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# not honored, see
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# not honored, see
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# https://sourceforge.net/p/libpng/bugs/210/#33f1
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# https://sourceforge.net/p/libpng/bugs/210/#33f1
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# '--with-zlib=' + self.spec['zlib'].prefix,
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# '--with-zlib=' + self.spec['zlib'].prefix,
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'CFLAGS={0}'.format(self.spec['zlib'].headers.include_flags),
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'CPPFLAGS={0}'.format(self.spec['zlib'].headers.include_flags),
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'LDFLAGS={0}'.format(self.spec['zlib'].libs.search_flags)
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'LDFLAGS={0}'.format(self.spec['zlib'].libs.search_flags)
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]
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]
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return args
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return args
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