build: use gmake on OpenBSD

build.sh

@@ -14,5 +14,12 @@ else
 fi
 
 echo "$TAG Compiling binutils (usually 5-10 minutes)..."
+
+if command -v gmake >/dev/null 2>&1; then
+  make_command=gmake
+else
+  make_command=make
+fi
+
 run_quietly giteapc-build.log \
-make -j"$cores"
+$make_command -j"$cores"

install.sh

@@ -6,10 +6,16 @@
 source util.sh
 PREFIX="$1"
 
+if command -v gmake >/dev/null 2>&1; then
+  make_command=gmake
+else
+  make_command=make
+fi
+
 cd build
 echo "$TAG Installing to local folder..."
 run_quietly giteapc-install.log \
-make install-strip
+$make_command install-strip
 cd ..
 
 # Symbolic link executables to $PREFIX/bin