Small fixes

build.sh

@@ -47,10 +47,12 @@ if [ ! -f "lbaselib.o" ]; then
         -c
 fi
 
-clang ../src/metaprogram/metaprogram.cpp -o metaprogram.exe \
-    -nostdlib++ -fno-exceptions -fdiagnostics-absolute-paths -g \
-    -Wno-writable-strings \
-    -I../src
+if [ ! -f "metaprogram.exe" ]; then
+    clang ../src/metaprogram/metaprogram.cpp -o metaprogram.exe \
+        -nostdlib++ -fno-exceptions -fdiagnostics-absolute-paths -g \
+        -Wno-writable-strings \
+        -I../src
+fi
 ./metaprogram.exe
 
 clang ../src/text_editor/text_editor.cpp ../src/basic/unix.cpp -o te_linux.exe \