diff --git a/src/runtime/c/Makefile.am b/src/runtime/c/Makefile.am
index 918c5b48f..123b4c0bb 100644
--- a/src/runtime/c/Makefile.am
+++ b/src/runtime/c/Makefile.am
@@ -27,7 +27,8 @@ libpgf_la_SOURCES = \
 	pgf/expr.h \
 	pgf/namespace.h
 
-libpgf_la_LDFLAGS = "-no-undefined -lrt"
+libpgf_la_LDFLAGS = -no-undefined
+libpgf_la_LIBADD = -lrt
 libpgf_la_CXXFLAGS = -fno-rtti
 
 bin_PROGRAMS =
diff --git a/src/runtime/c/configure.ac b/src/runtime/c/configure.ac
index c90189411..a7cba3e2a 100644
--- a/src/runtime/c/configure.ac
+++ b/src/runtime/c/configure.ac
@@ -17,6 +17,7 @@ AC_CONFIG_HEADERS([config.h])
 
 AM_MAINTAINER_MODE([enable])
 AC_CHECK_LIB(m,nan)
+AC_CHECK_LIB(rt,nan)
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
 AC_PROG_LIBTOOL