Index: b/focus-blur/src/src/Makefile.am
===================================================================
--- a/focus-blur/src/src/Makefile.am
+++ b/focus-blur/src/src/Makefile.am
@@ -59,7 +59,8 @@
 LDADD = \
 	$(GTHREAD_LIBS)		\
 	$(GIMP_LIBS)		\
-	$(FFTW3_LIBS)
+	$(FFTW3_LIBS)		\
+	-lm
 
 focusblurstock.$(OBJEXT): $(top_srcdir)/pixmaps/pixbufs.h
 $(top_srcdir)/pixmaps/pixbufs.h:
Index: b/focus-blur/src/src/Makefile.in
===================================================================
--- a/focus-blur/src/src/Makefile.in
+++ b/focus-blur/src/src/Makefile.in
@@ -228,7 +228,8 @@
 LDADD = \
 	$(GTHREAD_LIBS)		\
 	$(GIMP_LIBS)		\
-	$(FFTW3_LIBS)
+	$(FFTW3_LIBS)		\
+	-lm
 
 all: all-am
 
