Specify pkgconfig directory

PKGBUILD

@@ -21,9 +21,10 @@ build() {
   cd $pkgname-${pkgver/_/-}
 
   ./configure --prefix=/usr --mandir=/usr/share/man \
-     --with-shared --with-normal --without-debug --without-ada \
+    --with-pkg-config-libdir=/usr/lib/pkgconfig \
-     --enable-widec --enable-pc-files --with-cxx-binding --with-cxx-shared \
+    --with-shared --with-normal --without-debug --without-ada \
-     --enable-ext-colors --enable-ext-mouse
+    --enable-widec --enable-pc-files --with-cxx-binding --with-cxx-shared \
+    --enable-ext-colors --enable-ext-mouse
   make
 }