在configure.ac前边添加以下内容：
# backwards compat with older pkg-config # - pull in AC_DEFUN from pkg.m4 m4_ifndef([PKG_CHECK_VAR], [ # PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ------------------------------------------- # Retrieves the value of the pkg-config variable for the given module. AC_DEFUN([PKG_CHECK_VAR], [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl _PKG_CONFIG([$1], [variable="][$3]["], [$2]) AS_VAR_COPY([$1], [pkg_cv_][$1]) AS_VAR_IF([$1], [""], [$5], [$4])dnl ])# PKG_CHECK_VAR ])
参考：https://blog.csdn.net/a363344923/article/details/105417015标签：ac,configure,AC,Centos7,PKG,VAR,CHECK,pkg From： https://www.cnblogs.com/coolYuan/p/16963405.html