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diff -u ghc-7.4.1/ghc/ghc.wrapper\~ ghc-7.4.1/ghc/ghc.wrapper
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--- ghc-7.4.1/ghc/ghc.wrapper~	2012-02-02 03:10:32.000000000 +0900
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+++ ghc-7.4.1/ghc/ghc.wrapper	2012-05-02 19:39:05.503872527 +0900
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@@ -1 +1 @@
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-exec "$executablename" -B"$topdir" ${1+"$@"}
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+exec "$executablename" -B"$topdir" -optc-I$(pkg-config --variable=includedir libffi) ${1+"$@"}