AIX下编译出错

txbdir

各位大虾，我在AIX下编译C与C++混合代码，编译出错，出错提示出下：
1540-5215 (W) No licenses available. Contact your program supplier to add additional users. Compilation will proceed shortly.
"/usr/vacpp/include/stdlib.h", line 112.13: 1540-1172 (S) More than one function "strtof" has non-C++ linkage.
"/usr/include/stdlib.h", line 718.13: 1540-0424 (I) "strtof" is declared on line 718 of "/usr/include/stdlib.h".

请问一下这是由于什么原因引起的呢？