--- a/configure.in
+++ b/configure.in
@@ -4,7 +4,7 @@
 AC_CONFIG_SRCDIR(src/pslib.c)
 AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
 
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE
 
 AC_PROG_INTLTOOL
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -36,7 +36,7 @@
 	ps_fontenc.c \
 	ps_strbuf.c
 
-libps_la_LIBADD = $(LIBHNJ_LIBS) $(PNG_LIBS) $(JPEG_LIBS) $(GIF_LIBS) $(TIFF_LIBS)
+libps_la_LIBADD = $(LIBHNJ_LIBS) $(PNG_LIBS) $(JPEG_LIBS) $(GIF_LIBS) $(TIFF_LIBS) -lm
 
 BUILD_LIBS = -lm