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diff --git a/config/companion_libs.in b/config/companion_libs.in
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+# Companion libraries config options
+# Those libraries are required for different versions of gcc,
+# and can be used by binutils and gdb (maybe others as well).
+
+menu "Companion libraries"
+
+config GMP_MPFR
+    bool
+    prompt "GMP and MPFR"
+    help
+      gcc 4.3.0 and above requires both GMP and MPFR to build some frontends,
+      and some other components can use them as well (eg. binutils and gdb).
+      
+      Say 'Y' here if you want to build those two libraries specifically
+      for crosstool-NG.
+      
+      The packages that can use GMP and MPFR are:
+        - binutils
+        - gcc
+        - gdb
+
+config GMP_MPFR_TARGET
+    bool
+    prompt "Build libraries for the target"
+    depends on GMP_MPFR
+    depends on ! BARE_METAL
+    default n
+    help
+      Also build libraries for the target. This can be usefull if you want
+      to later build a compiler that will run on the target, or if you want
+      to run gdb natively on the target.
+
+if GMP_MPFR
+source config/companion_libs/gmp.in
+source config/companion_libs/mpfr.in
+endif
+
+endmenu