Fix build on Ruby 1.9.x without pkgconfig file

qtruby/rubylib/qtruby/configure.in.in

@@ -12,10 +12,13 @@ else
     RUBY_VERSION=`$PKGCONFIG ruby --modversion 2>/dev/null`
     if test -n "$RUBY_VERSION"; then
       RUBY_CFLAGS=`$PKGCONFIG ruby --cflags`
-    else
+    fi
+    if test -z "$RUBY_VERSION"; then
       RUBY_VERSION=`$PKGCONFIG ruby-1.9 --modversion 2>/dev/null`
+      if test -n "$RUBY_VERSION"; then
         RUBY_CFLAGS=`$PKGCONFIG ruby-1.9 --cflags`
       fi
+    fi
     if test -z "$RUBY_VERSION"; then
       # pkgconfig file does not exist but might be 1.9.1: RUBY_VERSION defined in ruby/version.h
       if test -n "$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"rubyhdrdir"@:>@)'"; then
@@ -25,6 +28,8 @@ else
         RUBY_TEENY=`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"['TEENY']"@:>@)'`
         if test "$RUBY_MAJOR" == "1" && test "$RUBY_MINOR" == "9"; then
           RUBY_VERSION="$RUBY_MAJOR.$RUBY_MINOR.$RUBY_TEENY"
+          RUBY_CFLAGS="-I`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"rubyhdrdir"@:>@)'`"
+          RUBY_CFLAGS="$RUBY_CFLAGS/`$RUBY -r rbconfig -e 'printf("%s",RbConfig::CONFIG@<:@"arch"@:>@)'` $RUBY_CFLAGS"
         fi
       fi
     fi