Index: /issm/trunk-jpl/externalpackages/gmt/configs/6/static/linux/cmake/ConfigUser.static.cmake
===================================================================
--- /issm/trunk-jpl/externalpackages/gmt/configs/6/static/linux/cmake/ConfigUser.static.cmake	(revision 26757)
+++ /issm/trunk-jpl/externalpackages/gmt/configs/6/static/linux/cmake/ConfigUser.static.cmake	(revision 26758)
@@ -39,5 +39,5 @@
 
 # Installation path (usually defaults to /usr/local) [auto]:
-set (CMAKE_INSTALL_PREFIX "$ENV{ISSM_DIR}/externalpackages/gmt/install")
+set (CMAKE_INSTALL_PREFIX "$ENV{PREFIX}")
 
 # Set install name suffix used for directories and gmt executables
Index: /issm/trunk-jpl/externalpackages/gmt/configs/6/static/mac/cmake/ConfigUser.static.cmake
===================================================================
--- /issm/trunk-jpl/externalpackages/gmt/configs/6/static/mac/cmake/ConfigUser.static.cmake	(revision 26757)
+++ /issm/trunk-jpl/externalpackages/gmt/configs/6/static/mac/cmake/ConfigUser.static.cmake	(revision 26758)
@@ -39,5 +39,5 @@
 
 # Installation path (usually defaults to /usr/local) [auto]:
-set (CMAKE_INSTALL_PREFIX "$ENV{ISSM_DIR}/externalpackages/gmt/install")
+set (CMAKE_INSTALL_PREFIX "$ENV{PREFIX}")
 
 # Set install name suffix used for directories and gmt executables