fixed a bug in the build system (#38997)

Author: Volker-Weissmann

Make.inc

@@ -1556,9 +1556,11 @@ endif
 LIBGCC_BUILD_DEPLIB := $(call dep_lib_path,$(build_libdir),$(build_shlibdir)/$(LIBGCC_NAME))
 LIBGCC_INSTALL_DEPLIB := $(call dep_lib_path,$(libdir),$(private_shlibdir)/$(LIBGCC_NAME))
 
-# USE_SYSTEM_LIBM causes it to get symlinked into build_private_shlibdir
+# USE_SYSTEM_LIBM and USE_SYSTEM_OPENLIBM causes it to get symlinked into build_private_shlibdir
 ifeq ($(USE_SYSTEM_LIBM),1)
 LIBM_BUILD_DEPLIB := $(call dep_lib_path,$(build_libdir),$(build_private_shlibdir)/$(LIBMNAME).$(SHLIB_EXT))
+else ifeq ($(USE_SYSTEM_OPENLIBM),1)
+LIBM_BUILD_DEPLIB := $(call dep_lib_path,$(build_libdir),$(build_private_shlibdir)/$(LIBMNAME).$(SHLIB_EXT))
 else
 LIBM_BUILD_DEPLIB := $(call dep_lib_path,$(build_libdir),$(build_shlibdir)/$(LIBMNAME).$(SHLIB_EXT))
 endif