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I am using various stdlib functions like srand(), etc. I have the line #include <stdlib.h> at the top of my code. I entered this on the command line: # find / -name stdlib.h find: `/home/dmurvihill/.gvfs: permission denied /usr/include/stdlib.h /usr/include/bits/stdlib.h So, stdlib.h is clearly in /usr/include. My preprocessor: # gcc -print-prog-name=cc1 /usr/libexec/gcc/x86_64-redhat-linux/4.5.1/cc1 My preprocessor's default search path: # /usr/libexec/gcc/x86_64-redhat-linux/4.5.1/cc1 -v ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/4.5.1/include-fixed" ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../x86_64-redhat-linux/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/lib/gcc/x86_64-redhat-linux/4.5.1/include /usr/include End of search list. So, stdlib.h is clearly in /usr/include, which is most definitely supposed to be searched by my preprocessor, but I still get this error! /path/to/cpa_sample_code_main.c:15:20: fatal error: stdlib.h: No such file or directory compilation terminated Update A program I wrote to test this code: #include <stdio.h> #include <stdlib.h> #include <linux/time.h> int main() { printf("Hello, World!\n"); printf("Getting time...\n"); time_t seconds; time(&seconds); printf("Seeding generator...\n"); srand((unsigned int)seconds); printf("Getting random number...\n"); int value = rand(); printf("It is %d!",value); printf("Goodbye, cruel world!"); return 0; } The command gcc -H -v -fsyntax-only stdlib_test.c output Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_

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