m4_pattern_allow.

编译swfdec(autoconf)遇到:

configure.ac:34: error: possibly undefined macro: AS_COMPILER_FLAGS
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
然后修改configure.ac文件(加一个空行,这样输入autoconf时会从新扫描configure.ac),

输入:aclocal -I m4

然后再输入autoconf问题解决

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