fix installation of includes and add a lua.pc to help other packages

lua/lua.pc

@@ -0,0 +1,10 @@
+prefix=@l_prefix@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: LUA
+Description: LUA Programming Language
+Version: @version@
+Cflags: -I${includedir}/lua
+Libs: -L${libdir} @libs@

lua/lua.spec

@@ -40,6 +40,7 @@ Release:      20061211
 
 #   list of sources
 Source0:      http://www.lua.org/ftp/lua-%{version}.tar.gz
+Source1:      lua.pc
 Patch0:       lua.patch
 
 #   build information
@@ -85,24 +86,35 @@ AutoReqProv:  no
     export MYCFLAGS=""
     export MYLIBS=""
 %if "%{with_readline}" == "yes"
-    MYCFLAGS="$MYCFLAGS -DLUA_USE_READLINE `pkg-config readline --cflags`"
-    MYLIBS="$MYLIBS `pkg-config readline --libs`"
+    MYCFLAGS="$MYCFLAGS -DLUA_USE_READLINE `pkg-config readline --cflags-only-I`"
+    MYLIBS="$MYLIBS `pkg-config readline --libs-only-l`"
 %endif
     %{l_make} %{l_mflags -O} \
         CC="%{l_cc} %{l_cflags -O}" \
         MYCFLAGS="$MYCFLAGS" \
         MYLIBS="$MYLIBS" \
         INSTALL_TOP="%{l_prefix}" \
-        INSTALL_INC="\$(INSTALL_ROOT)/include/lua" \
+        INSTALL_INC="\$(INSTALL_TOP)/include/lua" \
         $platform
 
 %install
     rm -rf $RPM_BUILD_ROOT
     %{l_make} %{l_mflags} install \
-        INSTALL_TOP=$RPM_BUILD_ROOT%{l_prefix}
+        INSTALL_TOP="$RPM_BUILD_ROOT%{l_prefix}" \
+        INSTALL_INC="\$(INSTALL_TOP)/include/lua"
     strip $RPM_BUILD_ROOT%{l_prefix}/bin/* >/dev/null 2>&1 || true
     %{l_shtool} install -c -m 644 \
         doc/manual.html $RPM_BUILD_ROOT%{l_prefix}/share/lua/
+    %{l_shtool} mkdir -f -p -m 755 \
+        $RPM_BUILD_ROOT%{l_prefix}/lib/pkgconfig
+    libs="-lua"
+    case "%{l_platform -t}" in
+        *-sunos* ) libs="$libs -ldl" ;;
+    esac
+    %{l_shtool} install -c -m 644 %{l_value -s -a} \
+        -e "s;@version@;%{version};g" \
+        -e "s;@libs@;$libs;g" \
+        %{SOURCE lua.pc} $RPM_BUILD_ROOT%{l_prefix}/lib/pkgconfig/
     %{l_rpmtool} files -v -ofiles -r$RPM_BUILD_ROOT \
         %{l_files_std} \
         '%doc %{l_prefix}/share/lua/manual.html'