From 02922173c8d5f35f1d3730254eccf0621e55cbe7 Mon Sep 17 00:00:00 2001
From: Christoph Junghans <junghans@votca.org>
Date: Thu, 3 Nov 2016 12:12:17 -0600
Subject: [PATCH] cmake: fix build with GMX_EXTERNAL_TNG=ON

tng_set_source_properties is not defined in case of GMX_EXTERNAL_TNG=ON
due to the fact that BuildTNG.cmake never gets included. Also this
call isn't really needed tng doesn't get compile when external anyway.

Change-Id: Id3c7e0da55ce9ef8cf43d2aecaa187e965bf6ad2
---
 src/gromacs/CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gromacs/CMakeLists.txt b/src/gromacs/CMakeLists.txt
index b7d9bf4..8b7fe3f 100644
--- a/src/gromacs/CMakeLists.txt
+++ b/src/gromacs/CMakeLists.txt
@@ -123,7 +123,9 @@ list(APPEND LIBGROMACS_SOURCES ${THREAD_MPI_SOURCES})
 
 if(GMX_USE_TNG)
     list(APPEND LIBGROMACS_SOURCES ${TNG_SOURCES})
-    tng_set_source_properties(WITH_ZLIB ${HAVE_ZLIB})
+    if (NOT GMX_EXTERNAL_TNG)
+        tng_set_source_properties(WITH_ZLIB ${HAVE_ZLIB})
+    endif()
 endif()
 
 get_lmfit_properties(LMFIT_SOURCES LMFIT_LIBRARIES_TO_LINK LMFIT_INCLUDE_DIRECTORY LMFIT_INCLUDE_DIR_ORDER)
-- 
2.7.3