diff --git a/vtk-compat_gl.changes b/vtk-compat_gl.changes
index 47e17b3..3786913 100644
--- a/vtk-compat_gl.changes
+++ b/vtk-compat_gl.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Oct 24 11:55:17 UTC 2017 - dimstar@opensuse.org
+
+- Setup MPI environment before building.
+
 -------------------------------------------------------------------
 Thu Oct 12 20:47:27 UTC 2017 - jengelh@inai.de
 
diff --git a/vtk-compat_gl.spec b/vtk-compat_gl.spec
index 6d4a5eb..8865b3a 100644
--- a/vtk-compat_gl.spec
+++ b/vtk-compat_gl.spec
@@ -310,6 +310,10 @@ grep -rl '\.\./\.\./\.\./\.\./VTKData' . | xargs -r perl -pi -e's,\.\./\.\./\.\.
 export CFLAGS="%{optflags}"
 export CXXFLAGS="%{optflags}"
 
+if [ -f %{_libdir}/mpi/gcc/openmpi/bin/mpivars.sh ]; then
+  source %{_libdir}/mpi/gcc/openmpi/bin/mpivars.sh
+fi
+
 mkdir build
 pushd build
 cmake .. \
diff --git a/vtk.changes b/vtk.changes
index 47e17b3..3786913 100644
--- a/vtk.changes
+++ b/vtk.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Oct 24 11:55:17 UTC 2017 - dimstar@opensuse.org
+
+- Setup MPI environment before building.
+
 -------------------------------------------------------------------
 Thu Oct 12 20:47:27 UTC 2017 - jengelh@inai.de
 
diff --git a/vtk.spec b/vtk.spec
index 21ccc52..c5c7bbe 100644
--- a/vtk.spec
+++ b/vtk.spec
@@ -310,6 +310,10 @@ grep -rl '\.\./\.\./\.\./\.\./VTKData' . | xargs -r perl -pi -e's,\.\./\.\./\.\.
 export CFLAGS="%{optflags}"
 export CXXFLAGS="%{optflags}"
 
+if [ -f %{_libdir}/mpi/gcc/openmpi/bin/mpivars.sh ]; then
+  source %{_libdir}/mpi/gcc/openmpi/bin/mpivars.sh
+fi
+
 mkdir build
 pushd build
 cmake .. \