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diff -ur wcslib-4.3.1/makedefs.in wcslib-4.3.1.new/makedefs.in
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--- wcslib-4.3.1/makedefs.in	2007-12-27 06:57:22.000000000 +0100
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+++ wcslib-4.3.1.new/makedefs.in	2009-03-16 15:50:23.000000000 +0100
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@@ -107,7 +107,7 @@
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 # Shared (dynamic) library (see note 3 above).
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   SHRLIB   := @SHRLIB@
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   SHRFLAGS := @SHRFLAGS@
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-  SHRLD    := @SHRLD@
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+  SHRLD    := @SHRLD@ -lm
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   SHRLN    := @SHRLN@
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 # Installation utilities and locations.