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diff -ur cfitsio/cfitsio.pc.in cfitsio.new/cfitsio.pc.in
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--- cfitsio/cfitsio.pc.in	2011-10-29 16:54:43.081132723 +0200
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+++ cfitsio.new/cfitsio.pc.in	2011-10-29 16:56:49.933619756 +0200
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@@ -8,4 +8,4 @@
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 Version: 3.280
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 Libs: -L${libdir} -lcfitsio @LIBS@
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 Libs.private: -lm
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-Cflags: -I${includedir}
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+Cflags: -D_REENTRANT -I${includedir}