Index: src/Makefile.in
--- src/Makefile.in.orig
+++ src/Makefile.in
@@ -187,7 +187,7 @@ output.c \
 texts.h
 
 INCLUDES = @GTK_CFLAGS@
-LDADD = @GTK_LIBS@
+LDADD = @GTK_LIBS@ -lm
 CLEANFILES = *~
 DISTCLEANFILES = .deps/*.P
 all: all-am