diff --git a/doc/doxygen.cfg b/doc/doxygen.cfg
index 2ca15d41..a2c4fd07 100644
--- a/doc/doxygen.cfg
+++ b/doc/doxygen.cfg
@@ -264,12 +264,10 @@ GENERATE_TAGFILE       =
 ALLEXTERNALS           = NO
 EXTERNAL_GROUPS        = NO
 EXTERNAL_PAGES         = NO
-PERL_PATH              = /usr/bin/perl
 #---------------------------------------------------------------------------
 # Configuration options related to the dot tool
 #---------------------------------------------------------------------------
 CLASS_DIAGRAMS         = NO
-MSCGEN_PATH            =
 HIDE_UNDOC_RELATIONS   = YES
 HAVE_DOT               = NO
 DOT_NUM_THREADS        = 0