WARNING: 'missing' script is too old or missing

I encountered an odd bug while compiling GeoIP 1.6.2 on a CentOS 7 64bits system. ac_aux_dir is not being properly initialized, causing $am_aux_dir to be set to ${HOME}, instead of build directory. At first I thought is related to the location of AM_INIT_AUTOMAKE in configure.ac but that is not the case. Is it possible to define AC_CONFIG_AUX_DIR, in order to avoid any script confusion?
Build warnings:

+ ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --disable-static --with-pic
/bin/sh: /home/floren/missing: No such file or directory
configure: WARNING: 'missing' script is too old or missing
+ /usr/bin/make -j8
benchmark.c: In function 'testgeoipcountry':
benchmark.c:59:17: warning: variable 'str' set but not used [-Wunused-but-set-variable]
     const char *str = NULL;
                 ^
benchmark.c: In function 'testgeoiporg':
benchmark.c:83:11: warning: variable 'i3' set but not used [-Wunused-but-set-variable]
     char *i3 = NULL;
           ^
test-geoip-city.c: In function 'main':
test-geoip-city.c:34:9: warning: variable 'generate' set but not used [-Wunused-but-set-variable]
     int generate = 0;
         ^
test-geoip-org.c: In function 'main':
test-geoip-org.c:33:9: warning: variable 'generate' set but not used [-Wunused-but-set-variable]
     int generate = 0;
         ^
test-geoip-domain.c: In function 'main':
test-geoip-domain.c:35:9: warning: variable 'generate' set but not used [-Wunused-but-set-variable]
     int generate = 0;
         ^
test-geoip-asnum.c: In function 'main':
test-geoip-asnum.c:33:9: warning: variable 'generate' set but not used [-Wunused-but-set-variable]
     int generate = 0;
         ^
test-geoip-isp.c: In function 'main':
test-geoip-isp.c:33:9: warning: variable 'generate' set but not used [-Wunused-but-set-variable]
     int generate = 0;

[oschwald]

Thanks. I believe all of these issues have now been fixed in master.