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在RedHat Linux 5.4 下安裝了Oracle 10g進行Pro*C編譯文件時，出現如下錯誤：
Pro*C/C++: Release 10.2.0.1.0 - Production on Wed Aug 17 12:55:33 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
System default option values taken from: /u01/app/oracle/product/10.2.0/db_1/precomp/admin/pcscfg.cfg
PCC-I-02106, Userid only used when SQLCHECK = FULL, userid ignored.
Error at line 33, column 10 in file /usr/include/string.h
#include <stddef.h>
.........1
PCC-S-02015, unable to open include file
Error at line 34, column 11 in file /usr/include/stdio.h
# include <stddef.h>
..........1
PCC-S-02015, unable to open include file
將源文件拿到RHEL4上同樣安裝ORACLE 10g進行編譯，未發生錯誤。
考慮到RHEL4和RHEL 5的gcc版本不同併發生找不到gcc頭文件的情況，那發生這個情況的原因應該是gcc的頭文件目錄改變了，而oracle的pcscfg.cfg文件未作相應變化。
於是在/usr下查找該文件
[oracle@test usr]$find /usr -name stddef.h -print
/usr/src/kernels/2.6.18-238.19.1.el5-i686/include/linux/stddef.h
/usr/src/kernels/2.6.18-194.el5-i686/include/linux/stddef.h
/usr/include/linux/stddef.h
/usr/lib/syslinux/com32/include/stddef.h
/usr/lib/syslinux/com32/include/bitsize/stddef.h
find: /usr/lib/audit: Permission denied
/usr/lib/gcc/i386-redhat-linux/4.1.1/include/stddef.h
/usr/lib/gcc/i386-redhat-linux/3.4.6/include/stddef.h
/usr/lib/bcc/include/stddef.h
選擇使用 4.1.1的頭文件目錄/usr/lib/gcc/i386-redhat-linux/4.1.1/include/，添加到 $ORACLE_HOME/precomp/admin/pcscfg.cfg 再次編譯就不會出錯了。