/usr/bin/ruby19 extconf.rb
checking for db_version() in -ldb-5.1... no
checking for db_version() in -ldb-5.0... no
checking for db_version() in -ldb-4.9... no
checking for db_version() in -ldb-4.8... yes
Writing bdb_aux._c (defines), this takes a while
don't know how to handle DB_DEGREE_2 DB_READ_COMMITTED, guessing UINT
don't know how to handle DB_DIRTY_READ DB_READ_UNCOMMITTED, guessing UINT

wrote 432 defines
creating Makefile

make
compiling bdb.c
bdb.c: In function ‘raise_error’:
bdb.c:84:0: warning: "eDbE_create" redefined
bdb.c:50:0: note: this is the location of the previous definition
bdb.c: In function ‘assoc_rescue’:
bdb.c:1200:11: warning: format not a string literal and no format arguments
bdb.c: In function ‘Init_bdb’:
bdb.c:3331:0: warning: "eDbE_create" redefined
bdb.c:84:0: note: this is the location of the previous definition
bdb.c:3424:0: warning: "ENV_LOG_CONFIG_FUNC" redefined
bdb.c:2533:0: note: this is the location of the previous definition
linking shared-object bdb.so
bdb.o: In function `env_get_lg_regionmax':
bdb.c:(.text+0xe4f): undefined reference to `UINT2FIX'
bdb.o: In function `env_get_lg_max':
bdb.c:(.text+0xeaf): undefined reference to `UINT2FIX'
bdb.o: In function `env_get_lg_bsize':
bdb.c:(.text+0xf0f): undefined reference to `UINT2FIX'
collect2: ld returned 1 exit status
make: *** [bdb.so] Error 1