diff --git a/configure.in b/configure.in
index 0be7802..d19c8ec 100644
--- a/configure.in
+++ b/configure.in
@@ -24,7 +24,7 @@
 AM_PROG_LIBTOOL
 LIBTOOL="$LIBTOOL --silent"
 
-pkg_modules="gtk+-2.0 >= 2.14.0 gthread-2.0"
+pkg_modules="gtk+-2.0 >= 2.14.0 gthread-2.0 gmodule-2.0"
 PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])
 
 sox_modules="sox >= 14.2.0"
@@ -33,6 +33,11 @@
 plugins_modules="cairo >= 1.6 glib-2.0 > 2.18.0"
 PKG_CHECK_MODULES(PLUGINS, [$plugins_modules])
 
+dnl Check for libm for sqrtf()
+AC_SEARCH_LIBS([sqrtf], [m], [], [
+	AC_MSG_ERROR([unable to find the sqrtf() function])
+])
+
 # get svn revision
 REVISION="r0"
 if test "x${REVISION}" = "xr0"
@@ -46,7 +51,7 @@
 if test "x${REVISION}" != "xr0"
 then
 	# force debug mode for a SVN working copy
-	CFLAGS="-g -Wall"
+	CFLAGS +="-Wall"
 else
 	REVISION="-1"
 fi