diff --git a/Installation/CMakeLists.txt b/Installation/CMakeLists.txt
index 9e55fd13bec..a655ad60789 100644
--- a/Installation/CMakeLists.txt
+++ b/Installation/CMakeLists.txt
@@ -481,7 +481,7 @@ endmacro()
 #  External libs Qt3 and Qt34are configured when Qt3 or Qt4 as lib of cgal are required
 #  Coin is used in KDS, but no FindCoin or FindCOIN exists
 #  There exists FindF2C, FindIPE, FindMKL, but they are only used to support supporting libs
-list (INSERT CGAL_SUPPORTING_3RD_PARTY_LIBRARIES 0 GMP MPFR ZLIB OpenGL LEDA MPFI RS RS3 OpenNL TAUCS Eigen3 BLAS LAPACK QGLViewer ESBTL Coin3D NTL )
+list (INSERT CGAL_SUPPORTING_3RD_PARTY_LIBRARIES 0 GMP MPFR ZLIB OpenGL LEDA MPFI RS RS3 OpenNL TAUCS Eigen3 BLAS LAPACK QGLViewer ESBTL Coin3D NTL IPE)
 if (NOT WIN32)
   # GMPXX is not supported on WIN32 machines
   list (INSERT CGAL_SUPPORTING_3RD_PARTY_LIBRARIES 1 GMPXX)
@@ -494,7 +494,7 @@ hide_variable(CGAL_SUPPORTING_3RD_PARTY_LIBRARIES)
 # set some to have special prefix
 set(CGAL_EXT_LIB_Qt4_PREFIX "QT") # as FindQt4 sets QT_FOUND, etc .. 
 set(CGAL_EXT_LIB_Eigen3_PREFIX "EIGEN3") # as FindEigen3 sets EIGEN3_FOUND, etc 
-set(CGAL_EXT_LIB_QGLViewer_PREFIX "QGLVIEWER") # as FindQGLViewer sets QGL_VIEWER_FOUND, etc  
+set(CGAL_EXT_LIB_QGLViewer_PREFIX "QGLVIEWER") # as FindQGLViewer sets QGLVIEWER_FOUND, etc  
 set(CGAL_EXT_LIB_Coin3D_PREFIX "COIN3D") # as FindCoin3D sets COIN3D_FOUND, COIN3D_INCLUDE_DIRS, COIN3D_LIBRARIES
 
 # some libraries are mandatory (stl and Boost.Thread are treated in another way)