commit e1c65bda69a3c678bc6834578f11debd636658e7
Author: François Trahay <francois.trahay@telecom-sudparis.eu>
Date:   Wed Apr 13 15:34:11 2016 +0200

    fix the detection of fortran compiler/flags

diff --git a/configure.ac b/configure.ac
index e9d4b9c..3ac266b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,8 +19,8 @@ AC_PROG_LIBTOOL
 AM_PROG_CC_C_O
 
 AC_CONFIG_MACRO_DIR([m4])
-F77=$(FC)
-FFLAGS=$(FCFLAGS)
+F77=$FC
+FFLAGS=$FCFLAGS
 
 dnl Don't generate 'configure' if pkg.m4 is missing.
 m4_pattern_forbid([PKG_CHECK_MODULES])
