libxc: phase out :fortran

Formula/libxc.rb

@@ -3,6 +3,7 @@ class Libxc < Formula
   homepage "http://octopus-code.org/wiki/Libxc"
   url "http://www.tddft.org/programs/octopus/down.php?file=libxc/3.0.1/libxc-3.0.1.tar.gz"
   sha256 "836692f2ab60ec3aca0cca105ed5d0baa7d182be07cc9d0daa7b80ee1362caf7"
+  revision 1
 
   bottle do
     cellar :any
@@ -11,14 +12,13 @@ class Libxc < Formula
     sha256 "6618cfcb1cd1a7d69991e97fbc1cda0d67b0dc1f99232057cc0cac9895e031e6" => :el_capitan
   end
 
-  depends_on :fortran
+  depends_on "gcc" # for gfortran
 
   def install
     system "./configure", "--prefix=#{prefix}",
                           "--enable-shared",
-                          "FCCPP=#{ENV.fc} -E -x c",
-                          "CC=#{ENV.cc}",
-                          "CFLAGS=-pipe"
+                          "FCCPP=gfortran -E -x c",
+                          "CC=#{ENV.cc}"
     system "make", "install"
   end
 
@@ -42,8 +42,8 @@ class Libxc < Formula
         use xc_f90_lib_m
       end program lxctest
     EOS
-    ENV.fortran
-    system ENV.fc, "test.f90", "-L#{lib}", "-lxc", "-I#{include}", "-o", "ftest"
+    system "gfortran", "test.f90", "-L#{lib}", "-lxc", "-I#{include}",
+                       "-o", "ftest"
     system "./ftest"
   end
 end