diff --git a/cfitsio-pkgconfig.patch b/cfitsio-pkgconfig.patch
new file mode 100644
index 0000000..276feb8
--- /dev/null
+++ b/cfitsio-pkgconfig.patch
@@ -0,0 +1,11 @@
+diff -ur cfitsio/cfitsio.pc.in cfitsio.new/cfitsio.pc.in
+--- cfitsio/cfitsio.pc.in	2013-04-08 20:11:56.000000000 +0200
++++ cfitsio.new/cfitsio.pc.in	2013-07-10 18:28:36.698569315 +0200
+@@ -7,5 +7,5 @@
+ Description: FITS File Subroutine Library
+ Version: @CFITSIO_MAJOR@.@CFITSIO_MINOR@
+ Libs: -L${libdir} -lcfitsio @LIBS@
+-Libs.private: -lm
+-Cflags: -I${includedir}
++Libs.private: -lm -lz @LIBS@
++Cflags: -I${includedir} -D_REENTRANT