diff -up grass-7.8.0/include/Make/Install.make.sopwith grass-7.8.0/include/Make/Install.make
--- grass-7.8.0/include/Make/Install.make.sopwith	2019-09-13 15:07:19.127928851 -0400
+++ grass-7.8.0/include/Make/Install.make	2019-09-13 15:25:55.583419717 -0400
@@ -91,6 +91,10 @@ else
 STARTUP = $(UNIX_BIN)/$(GRASS_NAME)
 endif
 
+ifndef GISBASE_RUNTIME
+GISBASE_RUNTIME=$(INST_DIR)
+endif
+
 FONTCAP = etc/fontcap
 TMPGISRC = demolocation/.grassrc$(GRASS_VERSION_MAJOR)$(GRASS_VERSION_MINOR)
 PLATMAKE = include/Make/Platform.make
@@ -125,7 +129,7 @@ $(INST_DIR) $(UNIX_BIN):
 	$(MAKE_DIR_CMD) $@
 
 $(STARTUP): $(ARCH_DISTDIR)/$(GRASS_NAME).tmp
-	sed -e 's#'@GISBASE@'#'$(INST_DIR)'#g' \
+	sed -e 's#'@GISBASE@'#'$(GISBASE_RUNTIME)'#g' \
 	    -e 's#'@LD_LIBRARY_PATH_VAR@'#'$(LD_LIBRARY_PATH_VAR)'#g' \
 	    -e 's#'@CONFIG_PROJSHARE@'#'$(PROJSHARE)'#g' \
 	    $< > $@