Index: meson-0.38.1/data/macros.meson
===================================================================
--- meson-0.38.1.orig/data/macros.meson
+++ meson-0.38.1/data/macros.meson
@@ -1,11 +1,13 @@
 %__meson %{_bindir}/meson
+%_vpath_srcdir .
+%_vpath_builddir build
 
 %meson \
-    export CFLAGS="${CFLAGS:-%__global_cflags}"       \
-    export CXXFLAGS="${CXXFLAGS:-%__global_cxxflags}" \
-    export FFLAGS="${FFLAGS:-%__global_fflags}"       \
-    export FCFLAGS="${FCFLAGS:-%__global_fcflags}"    \
-    export LDFLAGS="${LDFLAGS:-%__global_ldflags}"    \
+    export LANG=C.UTF-8 \
+    export CFLAGS="${CFLAGS:-%optflags}"       \
+    export CXXFLAGS="${CXXFLAGS:-%optflags}" \
+    export FFLAGS="${FFLAGS:-%optflags}"       \
+    export FCFLAGS="${FCFLAGS:-%optflags}"    \
     %{__meson}                              \\\
         --buildtype=plain                   \\\
         --prefix=%{_prefix}                 \\\