diff --git a/core/gmp/build b/core/gmp/build
index 9766e0ad..56c73e43 100755
--- a/core/gmp/build
+++ b/core/gmp/build
@@ -3,11 +3,10 @@
 cp -v configfsf.guess config.guess
 cp -v configfsf.sub   config.sub
 
-unset CFLAGS CXXFLAGS
-
 ./configure \
     --prefix=/usr \
     --localstatedir=/var/state/gmp \
+    --build="$(gcc -dumpmachine)" \
     --enable-cxx \
     --with-pic