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-rw-r--r--var/spack/repos/builtin/packages/libpng/package.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/var/spack/repos/builtin/packages/libpng/package.py b/var/spack/repos/builtin/packages/libpng/package.py
index a328bd44f8..cbab3c68a3 100644
--- a/var/spack/repos/builtin/packages/libpng/package.py
+++ b/var/spack/repos/builtin/packages/libpng/package.py
@@ -57,7 +57,7 @@ class Libpng(AutotoolsPackage):
# not honored, see
# https://sourceforge.net/p/libpng/bugs/210/#33f1
# '--with-zlib=' + self.spec['zlib'].prefix,
- 'CFLAGS={0}'.format(self.spec['zlib'].headers.include_flags),
+ 'CPPFLAGS={0}'.format(self.spec['zlib'].headers.include_flags),
'LDFLAGS={0}'.format(self.spec['zlib'].libs.search_flags)
]
return args