the argz.m4 header checks to see if error_t is defined, but only does so by including the argz.h header. if you try to build on a system that does provide error_t, but not argz.h, the argz replacement module fails to build. on glibc systems, error_t is defined in errno.h. perhaps the gl_FUNC_ARGZ should be checking to see if errno.h exists and if so, including it. -mike
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