[Kernel] error: ‘PATH_MAX’ undeclared (first use in this function)

如標題所說，今天在嘗試 Build Kernel 時發現了這個問題：

scripts/mod/sumversion.c: In function ‘get_src_version’:
scripts/mod/sumversion.c:384: error: ‘PATH_MAX’ undeclared (first use in this function)
scripts/mod/sumversion.c:384: error: (Each undeclared identifier is reported only once
scripts/mod/sumversion.c:384: error: for each function it appears in.)
scripts/mod/sumversion.c:384: warning: unused variable ‘filelist’
make[4]: *** [scripts/mod/sumversion.o] Error 1
make[3]: *** [scripts/mod] Error 2
make[2]: *** [scripts] Error 2
make[2]: Leaving directory `/home/steven_wu/dsr1000n/linux/kernel_2.6/linux'
make[1]: *** [linux] Error 2
make[1]: Leaving directory `/home/steven_wu/dsr1000n/linux/kernel_2.6'
make: *** [kernel] Error 2

這時只需要：

vim scripts/mod/sumversion.c

查看最上面的宣告中是否有 include  limits.h ，若沒有，則加入一行：

#include <limits.h>

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