Index: PKGBUILD
===================================================================
--- PKGBUILD	(revision 197107)
+++ PKGBUILD	(working copy)
@@ -28,7 +28,13 @@
 
   cd $srcdir/pam_unix2-2.9.1
   patch -Np1 -i ../pam_unix2-glibc216.patch
-  ./configure --libdir=/usr/lib --sbindir=/usr/bin
+
+  # modify flags to build against the pam compiled here, not a system lib.
+  ./configure \
+      CFLAGS="$CFLAGS -I$srcdir/Linux-PAM-$pkgver/libpam/include/" \
+      LDFLAGS="$LDFLAGS -L$srcdir/Linux-PAM-$pkgver/libpam/.libs/" \
+      --libdir=/usr/lib \
+      --sbindir=/usr/bin
   make
 }