Don't unset _PREFIX in mingw-env macro, it leads to ${_PREFIX} being empty when evaluated the lines above

macros.mingw32

@@ -62,7 +62,6 @@
     x=`echo $i|sed "s,${_PREFIX},,"|tr "a-z+-." "A-ZX__"`; \
     declare -x $x="$i" ; export $x; \
   done; \
-  unset _PREFIX; \
   CC="${MINGW32_CC:-%mingw32_cc}"; export CC; \
   CFLAGS="${MINGW32_CFLAGS-%mingw32_cflags}"; export CFLAGS; \
   CPPFLAGS="${MINGW32_CPPFLAGS-%mingw32_cppflags}"; export CPPFLAGS; \

macros.mingw64

@@ -62,7 +62,6 @@
     x=`echo $i|sed "s,${_PREFIX},,"|tr "a-z+-." "A-ZX__"`; \
     declare -x $x="$i" ; export $x; \
   done; \
-  unset _PREFIX; \
   CC="${MINGW64_CC:-%mingw64_cc}"; export CC; \
   CFLAGS="${MINGW64_CFLAGS-%mingw64_cflags}"; export CFLAGS; \
   CPPFLAGS="${MINGW64_CPPFLAGS-%mingw64_cppflags}"; export CPPFLAGS; \

macros.ucrt64

@@ -61,7 +61,6 @@
     x=`echo $i|sed "s,${_PREFIX},,"|tr "a-z+-." "A-ZX__"`; \
     declare -x $x="$i" ; export $x; \
   done; \
-  unset _PREFIX; \
   CC="${UCRT64_CC:-%ucrt64_cc}"; export CC; \
   CFLAGS="${UCRT64_CFLAGS-%ucrt64_cflags}"; export CFLAGS; \
   CPPFLAGS="${UCRT64_CPPFLAGS-%ucrt64_cppflags}"; export CPPFLAGS; \

mingw-filesystem.spec

@@ -6,8 +6,8 @@
 %global macrosdir %(d=%{_rpmconfigdir}/macros.d; [ -d $d ] || d=%{_sysconfdir}/rpm; echo $d)
 
 Name:           mingw-filesystem
-Version:        139
-Release:        2%{?dist}
+Version:        140
+Release:        1%{?dist}
 Summary:        MinGW cross compiler base filesystem and environment
 
 License:        GPLv2+
@@ -363,6 +363,10 @@ echo ".so man1/pkgconf.1" > %{buildroot}%{_mandir}/man1/x86_64-w64-mingw32ucrt-p
 %dir %{_prefix}/lib/debug/%{_prefix}/x86_64-w64-mingw32ucrt
 
 %changelog
+* Fri Jul 29 2022 Sandro Mani <manisandro@gmail.com> - 140-1
+- Don't unset _PREFIX in mingw-env macro, it leads to ${_PREFIX}
+  being empty when evaluated the lines above
+
 * Thu Jul 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 139-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild