--- a/data/macros.meson
+++ b/data/macros.meson
@@ -1,9 +1,15 @@
 %__meson %{_bindir}/meson
 %__meson_wrap_mode nodownload
 %__meson_auto_features enabled
+%_vpath_srcdir .
+%_vpath_builddir build
 
 %meson \
-    %set_build_flags \
+    export LANG=C.UTF-8                      \
+    export CFLAGS="${CFLAGS:-%optflags}"     \
+    export CXXFLAGS="${CXXFLAGS:-%optflags}" \
+    export FFLAGS="${FFLAGS:-%optflags}"     \
+    export FCFLAGS="${FCFLAGS:-%optflags}"   \
     %{shrink:%{__meson} \
         --buildtype=plain \
         --prefix=%{_prefix} \
@@ -25,21 +31,24 @@
         %{nil}}
 
 %meson_build \
+    export LANG=C.UTF-8 \
     %{shrink:%{__meson} compile \
         -C %{_vpath_builddir} \
-        -j %{_smp_build_ncpus} \
+        %{?_smp_mflags} \
         --verbose \
         %{nil}}
 
 %meson_install \
+    export LANG=C.UTF-8                      \
     %{shrink:DESTDIR=%{buildroot} %{__meson} install \
         -C %{_vpath_builddir} \
         --no-rebuild \
         %{nil}}
 
 %meson_test \
+    export LANG=C.UTF-8                      \
     %{shrink:%{__meson} test \
         -C %{_vpath_builddir} \
-        --num-processes %{_smp_build_ncpus} \
+        %{?jobs:--num-processes %{jobs}} \
         --print-errorlogs \
         %{nil}}