Description of problem:
During build (from srpm) I get the following error:

error: Installed (but unpackaged) file(s) found:
   /sbin/nfnl_osf
   /usr/local/share/xtables/pf.os

RPM build errors:
    Installed (but unpackaged) file(s) found:
   /sbin/nfnl_osf
   /usr/local/share/xtables/pf.os

I also get the following autoconf discrepancy during ./configure:
[...]
checking linux/proc_fs.h usability... no
checking linux/proc_fs.h presence... no
checking for linux/proc_fs.h... no

As far as I could tell, this file is from the kernel-devel package and I have the this package installed on my system. The file *is* present in /usr/src/kernels/<kernel_version>/include/linux/proc_fs.h. The kernel-headers package is also installed as well.

Version-Release number of selected component (if applicable):
Latest (1.4.12)

How reproducible:
Always

Steps to Reproduce:
1. rpm -ivh iptables-XXXX.src.rpm
2. cd build/SPECS
3. rpmbuild -bb iptables.spec
  
Actual results:
The above error & log

Expected results:
Compilation to pass and fs_proc.h to be recognised as "present" and to be used

Additional info:
The relevant part from config.log with regards to the proc_fs.h is as follows:

configure:10909: checking linux/proc_fs.h usability
configure:10909: gcc -c -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -march=native -mtune=native -fno-strict-aliasing  conftest.c >&5
conftest.c:59:27: error: linux/proc_fs.h: No such file or directory
configure:10909: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "iptables"
| #define PACKAGE_TARNAME "iptables"
| #define PACKAGE_VERSION "1.4.12.2"
| #define PACKAGE_STRING "iptables 1.4.12.2"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define PACKAGE "iptables"
| #define VERSION "1.4.12.2"
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_DLFCN_H 1
| #define LT_OBJDIR ".libs/"
| #define HAVE_LINUX_DCCP_H 1
| #define HAVE_LINUX_IP_VS_H 1
| #define HAVE_LINUX_MAGIC_H 1
| /* end confdefs.h.  */
| #include <stdio.h>
| #ifdef HAVE_SYS_TYPES_H
| # include <sys/types.h>
| #endif
| #ifdef HAVE_SYS_STAT_H
| # include <sys/stat.h>
| #endif
| #ifdef STDC_HEADERS
| # include <stdlib.h>
| # include <stddef.h>
| #else
| # ifdef HAVE_STDLIB_H
| #  include <stdlib.h>
| # endif
| #endif
| #ifdef HAVE_STRING_H
| # if !defined STDC_HEADERS && defined HAVE_MEMORY_H
| #  include <memory.h>
| # endif
| # include <string.h>
| #endif
| #ifdef HAVE_STRINGS_H
| # include <strings.h>
| #endif
| #ifdef HAVE_INTTYPES_H
| # include <inttypes.h>
| #endif
| #ifdef HAVE_STDINT_H
| # include <stdint.h>
| #endif
| #ifdef HAVE_UNISTD_H
| # include <unistd.h>
| #endif
| #include <linux/proc_fs.h>
configure:10909: result: no
configure:10909: checking linux/proc_fs.h presence
configure:10909: gcc -E  conftest.c
conftest.c:26:27: error: linux/proc_fs.h: No such file or directory
configure:10909: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "iptables"
| #define PACKAGE_TARNAME "iptables"
| #define PACKAGE_VERSION "1.4.12.2"
| #define PACKAGE_STRING "iptables 1.4.12.2"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define PACKAGE "iptables"
| #define VERSION "1.4.12.2"
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_DLFCN_H 1
| #define LT_OBJDIR ".libs/"
| #define HAVE_LINUX_DCCP_H 1
| #define HAVE_LINUX_IP_VS_H 1
| #define HAVE_LINUX_MAGIC_H 1
| /* end confdefs.h.  */
| #include <linux/proc_fs.h>
configure:10909: result: no
configure:10909: checking for linux/proc_fs.h
configure:10909: result: no