turn off attach and build dirs without ctprojs

dtool/src/attach/Sources.pp

@@ -1,13 +1,27 @@
-#define INSTALL_HEADERS \
+// This directory defines the ctattach tools, which are completely
+// undocumented and are only intended for use by the VR Studio as a
+// convenient way to manage development by multiple people within the
+// various Panda source trees.  These tools are not recommended for
+// use by the rest of the world; it's probably not worth the headache
+// of learning how to set them up.
+
+// Therefore, we only install the stuff in this directory if the
+// builder is already using the ctattach tools.  Otherwise, it's safe
+// to assume s/he doesn't need the ctattach tools.
+
+#define BUILD_DIRECTORY $[CTPROJS]
+#if $[CTPROJS]
+  #define INSTALL_HEADERS \
     ctattch.pl ctattch.pl.rnd ctunattach.pl ctquery.pl ctdelta.pl \
     ctdelta.pl.rnd unco.pl ctvspec.pl ctcm.pl ctccase.pl ctntool.pl \
     ctcvs.pl
 
-#define INSTALL_SCRIPTS \
+  #define INSTALL_SCRIPTS \
     ctattach.drv ctunattach.drv ctquery ctdelta ctihave ctallihave \
     ctunco ctattachcc cttimewarp get-cttree update-cttree get-delta \
     ctsanity ctmkelem ctmkdir ctci ctco ctrm ctmv ctmake neartool
 
-#define INSTALL_CONFIG \
+  #define INSTALL_CONFIG \
     dtool.cshrc dtool.init dtool.emacs dtool.alias \
     dtool.sh dtool.alias-sh
+#endif

dtool/src/build/Sources.pp

@@ -1,8 +1,22 @@
-#define INSTALL_HEADERS \
+// This directory defines the ctattach tools, which are completely
+// undocumented and are only intended for use by the VR Studio as a
+// convenient way to manage development by multiple people within the
+// various Panda source trees.  These tools are not recommended for
+// use by the rest of the world; it's probably not worth the headache
+// of learning how to set them up.
+
+// Therefore, we only install the stuff in this directory if the
+// builder is already using the ctattach tools.  Otherwise, it's safe
+// to assume s/he doesn't need the ctattach tools.
+
+#define BUILD_DIRECTORY $[CTPROJS]
+#if $[CTPROJS]
+  #define INSTALL_HEADERS \
     ctinstmake.pl ctproj.pl ctutils.pl
 
-#define INSTALL_SCRIPTS \
+  #define INSTALL_SCRIPTS \
     ctaddpkg ctaddtgt ctinitproj ctproj ctpathadjust
 
-#define EXTRA_DIST \
+  #define EXTRA_DIST \
     initialize
+#endif