diff -up galculator-1.3.4/configure.in.libm galculator-1.3.4/configure.in
--- galculator-1.3.4/configure.in.libm	2010-02-16 11:22:31.000000000 +0100
+++ galculator-1.3.4/configure.in	2010-02-16 11:22:12.000000000 +0100
@@ -11,6 +11,7 @@ AC_PROG_INTLTOOL(, no-xml)
 AC_ISC_POSIX
 
 AC_HEADER_STDC
+AC_CHECK_LIB([m],[tan])
 
 pkg_modules="gtk+-2.0 >= 2.6.0 libglade-2.0 >= 2.0.0"
 PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])