diff --git a/configure.sh b/configure.sh
index d1023a2..5dabd79 100755
--- a/configure.sh
+++ b/configure.sh
@@ -72,6 +72,13 @@ ln -sf $(command -v sh-elf-ranlib) sh3eb-elf/bin/ranlib
 
 cd build
 
+# OpenBSD apparently installs these in /usr/local
+if [[ $(uname) == "OpenBSD" ]]; then
+  extra_args="--with-gmp=/usr/local --with-mpfr=/usr/local --with-mpc=/usr/local"
+else
+  extra_args=
+fi
+
 echo "$TAG Configuring gcc..."
 run_quietly giteapc-configure.log \
-../gcc-$VERSION/configure --prefix="$PREFIX" --target=sh3eb-elf --with-multilib-list=m3,m4-nofpu --enable-languages=c,c++ --without-headers --with-newlib --program-prefix=sh-elf- --enable-libssp --enable-lto
+../gcc-$VERSION/configure --prefix="$PREFIX" --target=sh3eb-elf --with-multilib-list=m3,m4-nofpu --enable-languages=c,c++ --without-headers --with-newlib --program-prefix=sh-elf- --enable-libssp --enable-lto $extra_args