Add note on how to build with MUMPS-support

1 files changed, 10 insertions, 2 deletions

diff --git a/PKGBUILD b/PKGBUILD
index 91d970a334bc..4d4bb5655cce 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -2,7 +2,7 @@
 # Contributor: Max Schlemmer <max.schlemmer@gmail.com>
 pkgname=python-kwant
 pkgver=1.2.2
-pkgrel=1
+pkgrel=2
 pkgdesc="Python package for numerical calculations on tight-binding models with a strong focus on quantum transport"
 arch=('any')
 url="http://kwant-project.org/"
@@ -10,7 +10,7 @@ license=('BSD')
 depends=(python python-scipy lapack blas python-tinyarray)
 optdepends=(
 	'python-matplotlib: needed for plotting support and the tutorial'
-	'mumps: a sparse linear algebra library for speed up and memory usage reduction'
+	'mumps: a sparse linear algebra library for speed up and memory usage reduction (use AUR mumps-seq-shared or any other built as shared library)'
 )
 checkdepends=(python-nose)
 source=(
@@ -21,6 +21,14 @@ sha1sums=('7a2aa07492c3aee8930fd7de402e62fea84f3eca'
           'SKIP')
 validpgpkeys=('52299057FAD799653C4F088AC3F147F5980F3535')
 
+# Comment the prepare function if you want to build _without_ mumps support.
+# This is discouraged because without the incurred performance penalty no
+# serious calculations can be done in a reasonable time.
+prepare() {
+    cp "../build.conf" "$srcdir/kwant-$pkgver/build.conf"
+    cp "../setup.py" "$srcdir/kwant-$pkgver/setup.py"
+}
+
 build() {
     cd "$srcdir/kwant-$pkgver"
     python setup.py build