see PR merged https://github.com/uim/uim/pull/275.patch
pkg-config is used without being defined
--- a/configure.ac
+++ b/configure.ac
@@ -56,6 +56,7 @@ AC_PATH_PROGS(SED, sed gsed)
 AX_PATH_QMAKE4
 AX_PATH_QMAKE5
 AX_PATH_QMAKE6
+PKG_PROG_PKG_CONFIG
 
 AM_MAINTAINER_MODE