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diff --git a/pypy/module/crypt/interp_crypt.py b/pypy/module/crypt/interp_crypt.py
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index bd13f6f..1022c9e 100644
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--- a/pypy/module/crypt/interp_crypt.py
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+++ b/pypy/module/crypt/interp_crypt.py
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@@ -9,7 +9,7 @@ elif sys.platform.startswith('linux'):
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     # crypt() is defined only in crypt.h on some Linux variants (eg. Fedora 28)
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     eci = ExternalCompilationInfo(libraries=['crypt'], includes=["crypt.h"])
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 else:
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-    eci = ExternalCompilationInfo(libraries=['crypt'])
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+    eci = ExternalCompilationInfo(libraries=['crypt'], includes=['crypt.h'])
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 c_crypt = rffi.llexternal('crypt', [rffi.CCHARP, rffi.CCHARP], rffi.CCHARP,
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                           compilation_info=eci, releasegil=False)
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