diff --git a/Library/Formula/yacas.rb b/Library/Formula/yacas.rb
index b7e55da39630..e93b5e554ef9 100644
--- a/Library/Formula/yacas.rb
+++ b/Library/Formula/yacas.rb
@@ -2,11 +2,16 @@
 
 class Yacas < Formula
   homepage 'http://yacas.sourceforge.net'
-  url 'http://yacas.sourceforge.net/backups/yacas-1.3.4.tar.gz'
-  sha1 'b0918e7f1e697fde48f09055528dacbf7513b931'
+  url 'https://downloads.sourceforge.net/project/yacas/yacas-source/1.3/yacas-1.3.6.tar.gz'
+  sha1 'ee40d2156d54f08f8bb544edb5093259512d304b'
 
   option "with-server", "Build the network server version"
 
+  # Patch to configure, src/Makefile.am and src/Makefile.in
+  # install-sh -c -d doesn't work with directory name with trailing '/' => configure
+  # OS/X's echo doesn't support '-e' option => Makefile.am, Makefile.in
+  patch :p1, :DATA
+
   def install
     args = [ "--disable-silent-rules",
              "--disable-dependency-tracking",
@@ -20,3 +25,40 @@ def install
     system "make", "test"
   end
 end
+
+__END__
+--- yacas-1.3.6.orig/configure	2014-11-26 05:46:21.000000000 +0900
++++ yacas-1.3.6/configure	2014-12-30 17:02:39.000000000 +0900
+@@ -16939,7 +16939,7 @@
+ if test -n "$with_html_dir" ; then
+ 	htmldir=$with_html_dir
+ else
+-	htmldir=${datadir}/yacas/documentation/
++	htmldir=${datadir}/yacas/documentation
+ fi
+ 
+ 
+diff -ur yacas-1.3.6.orig/src/Makefile.am yacas-1.3.6/src/Makefile.am
+--- yacas-1.3.6.orig/src/Makefile.am	2014-11-26 00:33:54.000000000 +0900
++++ yacas-1.3.6/src/Makefile.am	2014-12-30 15:26:56.000000000 +0900
+@@ -104,7 +104,7 @@
+ 
+ $(builddir)/../include/yacas/yacas_version.h: ../config.h
+ 	mkdir -p $(builddir)/../include/yacas
+-	echo -e "#ifndef YACAS_VERSION_H\n#define YACAS_VERSION \"$(VERSION)\"\n#endif" > $(builddir)/../include/yacas/yacas_version.h
++	echo "#ifndef YACAS_VERSION_H\n#define YACAS_VERSION \"$(VERSION)\"\n#endif" > $(builddir)/../include/yacas/yacas_version.h
+ 
+ distclean-local:
+ 	-rm -f $(builddir)/../include/yacas/yacas_version.h
+diff -ur yacas-1.3.6.orig/src/Makefile.in yacas-1.3.6/src/Makefile.in
+--- yacas-1.3.6.orig/src/Makefile.in	2014-12-30 14:56:18.000000000 +0900
++++ yacas-1.3.6/src/Makefile.in	2014-12-30 15:26:56.000000000 +0900
+@@ -890,7 +890,7 @@
+ 
+ $(builddir)/../include/yacas/yacas_version.h: ../config.h
+ 	mkdir -p $(builddir)/../include/yacas
+-	echo -e "#ifndef YACAS_VERSION_H\n#define YACAS_VERSION \"$(VERSION)\"\n#endif" > $(builddir)/../include/yacas/yacas_version.h
++	echo "#ifndef YACAS_VERSION_H\n#define YACAS_VERSION \"$(VERSION)\"\n#endif" > $(builddir)/../include/yacas/yacas_version.h
+ 
+ distclean-local:
+ 	-rm -f $(builddir)/../include/yacas/yacas_version.h