HAVE_SPEEDTREE should be added to dtool_config.h

dtool/LocalSetup.pp

@@ -280,6 +280,9 @@ $[cdefine HAVE_OPENAL]
 /* Define if we have Freetype 2.0 or better available. */
 $[cdefine HAVE_FREETYPE]
 
+/* Define if we are using SpeedTree. */
+$[cdefine HAVE_SPEEDTREE]
+
 /* Define if we want to compile in a default font. */
 $[cdefine COMPILE_IN_DEFAULT_FONT]
 

makepanda/makepanda.py

@@ -1475,6 +1475,7 @@ DTOOL_CONFIG=[
     ("HAVE_OPENAL",                    'UNDEF',                  'UNDEF'),
     ("HAVE_NVIDIACG",                  'UNDEF',                  'UNDEF'),
     ("HAVE_FREETYPE",                  'UNDEF',                  'UNDEF'),
+    ("HAVE_SPEEDTREE",                 'UNDEF',                  'UNDEF'),
     ("HAVE_FFTW",                      'UNDEF',                  'UNDEF'),
     ("HAVE_OPENSSL",                   'UNDEF',                  'UNDEF'),
     ("HAVE_NET",                       'UNDEF',                  'UNDEF'),