Fix libstfl installs only to /usr/local

Refs #13127.

1 files changed, 3 insertions, 5 deletions

diff --git a/Library/Formula/libstfl.rb b/Library/Formula/libstfl.rb
index 2320b1f73..15603a56d 100644
--- a/Library/Formula/libstfl.rb
+++ b/Library/Formula/libstfl.rb
@@ -8,11 +8,9 @@ class Libstfl < Formula
   def patches; DATA; end
 
   def install
-    inreplace 'Makefile',
-              'export CC = gcc -pthread',
-              "export CC = #{ENV.cc} -pthread"
-
-    system "make install"
+    system "make", "install",
+                   "CC=#{ENV.cc} -pthread",
+                   "prefix=#{prefix}"
   end
 end