In Prefix we are really self-providing, so don't look back!
Original patch by Heiko Przybyl

/usr/lib and /lib are not valid locations to search for startfiles,
especially as they come BEFORE the prefix locations.

--- gcc/gcc.c
+++ gcc/gcc.c
@@ -1525,8 +1525,8 @@ static const char *gcc_libexec_prefix;
 #endif
 
 static const char *const standard_exec_prefix = STANDARD_EXEC_PREFIX;
-static const char *const standard_exec_prefix_1 = "/usr/libexec/gcc/";
-static const char *const standard_exec_prefix_2 = "/usr/lib/gcc/";
+static const char *const standard_exec_prefix_1 = "@GENTOO_PORTAGE_EPREFIX@/usr/libexec/gcc/";
+static const char *const standard_exec_prefix_2 = "@GENTOO_PORTAGE_EPREFIX@/usr/lib/gcc/";
 static const char *md_exec_prefix = MD_EXEC_PREFIX;
 
 static const char *md_startfile_prefix = MD_STARTFILE_PREFIX;
diff --git a/a/gcc/config/darwin.h b/b/gcc/config/darwin.h
index 482cd4c..b971c64 100644
--- gcc/config/darwin.h
+++ gcc/config/darwin.h
@@ -24,6 +24,15 @@ Boston, MA 02110-1301, USA.  */
 #ifndef CONFIG_DARWIN_H
 #define CONFIG_DARWIN_H
 
+#undef STANDARD_STARTFILE_PREFIX
+#define STANDARD_STARTFILE_PREFIX "@GENTOO_PORTAGE_TPREFIX@/usr/lib"
+
+#undef STANDARD_STARTFILE_PREFIX_1
+#define STANDARD_STARTFILE_PREFIX_1 "@GENTOO_PORTAGE_TPREFIX@/lib"
+
+#undef STANDARD_STARTFILE_PREFIX_2
+#define STANDARD_STARTFILE_PREFIX_2 STANDARD_STARTFILE_PREFIX_1
+
 /* The definitions in this file are common to all processor types
    running Darwin, which is the kernel for Mac OS X.  Darwin is
    basically a BSD user layer laid over a Mach kernel, then evolved