fix the dependency on librt

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 =

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