Running ./bootstrap.sh with newer autotools produces warnings:

$ ./bootstrap.sh
configure.in:1011: warning: AC_CACHE_VAL(libunixodbc_usable, ...): suspicious cache-id, must contain _cv to be cached
../../lib/autoconf/general.m4:1998: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2019: AC_CACHE_CHECK is expanded from...
m4/libunixodbc.m4:20: LIBUNIXODBC_CHECK_CONFIG is expanded from...
configure.in:1011: the top level
configure.in:1011: warning: AC_CACHE_VAL(libunixodbc_usable, ...): suspicious cache-id, must contain _cv to be cached
../../lib/autoconf/general.m4:1998: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2019: AC_CACHE_CHECK is expanded from...
m4/libunixodbc.m4:20: LIBUNIXODBC_CHECK_CONFIG is expanded from...
configure.in:1011: the top level
configure.in:1011: warning: AC_CACHE_VAL(libunixodbc_usable, ...): suspicious cache-id, must contain _cv to be cached
../../lib/autoconf/general.m4:1998: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2019: AC_CACHE_CHECK is expanded from...
m4/libunixodbc.m4:20: LIBUNIXODBC_CHECK_CONFIG is expanded from...
configure.in:1011: the top level
configure.in:1011: warning: AC_CACHE_VAL(libunixodbc_usable, ...): suspicious cache-id, must contain _cv to be cached
../../lib/autoconf/general.m4:1998: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2019: AC_CACHE_CHECK is expanded from...
m4/libunixodbc.m4:20: LIBUNIXODBC_CHECK_CONFIG is expanded from...
configure.in:1011: the top level
configure.in:1011: warning: AC_CACHE_VAL(libunixodbc_usable, ...): suspicious cache-id, must contain _cv to be cached
../../lib/autoconf/general.m4:1998: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2019: AC_CACHE_CHECK is expanded from...
m4/libunixodbc.m4:20: LIBUNIXODBC_CHECK_CONFIG is expanded from...
configure.in:1011: the top level