-If `uncompface-use-external' is non-nil, it requires the external
-programs `uncompface', and `icontopbm'. On a GNU/Linux system these
-might be in packages with names like `compface' or `faces-xface' and
-`netpbm' or `libgr-progs', for instance."
+If `uncompface-use-external' is t, it requires the external programs
+`uncompface', and `icontopbm'. On a GNU/Linux system these might be
+in packages with names like `compface' or `faces-xface' and `netpbm'
+or `libgr-progs', for instance."