diff --git a/src/env/RULES b/src/env/RULES
index 3cf8c75b8..02df6aa7a 100644
--- a/src/env/RULES
+++ b/src/env/RULES
@@ -8,8 +8,8 @@
 # This is a Makefile fragment, see src/libCom/Makefile.
 
 envData.c: $(LIBCOM)/env/envDefs.h \
-    $(TOOLS)/bldEnvData.pl $(TOOLS)/libcomModuleDirs.pm \
+    $(INSTALL_HOST_BIN)/bldEnvData.pl $(INSTALL_HOST_BIN)/libcomModuleDirs.pm \
     $(CONFIG)/CONFIG_ENV $(CONFIG)/CONFIG_SITE_ENV \
     $(wildcard $(CONFIG)/os/CONFIG_SITE_ENV.$(T_A))
-	$(PERL) $(TOOLS)/bldEnvData.pl $(QUIET_FLAG) -t $(T_A) \
+	$(PERL) $(INSTALL_HOST_BIN)/bldEnvData.pl $(QUIET_FLAG) -t $(T_A) \
 		-c $(CMPLR_CLASS) -s $(OS_CLASS) $(CONFIG)