E.g.:
modules/php3/libphp3.a(unified_odbc.o): In function `_free_result': /work/builds/php-3.0.11/functions/unified_odbc.c:192: undefined reference to `SQLFreeStmt' modules/php3/libphp3.a(unified_odbc.o): In function `_results_cleanup': /work/builds/php-3.0.11/functions/unified_odbc.c:208: undefined reference to `SQLFreeStmt'
Look at the linker line before the undefined reference messages start and check that there is a -lesoobclient flag. If this is missing, you have probably misconfigured PHP as described below. You can usually check this is what has happened by doing a grep for esoobclient in the top level Makefile. E.g.:
/work/php-3.0.12-> grep esoobclient Makefile
which should show something like:
LIBS = -lgd pcrelib/libpcre.a regex/libregex.a -lgdbm -L/usr/local/easysoft/oob/client/lib -lesoobclient -lgd -lm -ldl -lcrypt -lnsl -lresolv
The actual output will depend on the platform, but should contain -lesoobclient.
The CUSTOM_ODBC_LIBS defines the name of the shared object that provides the ODBC driver. In this case, this is the ODBC-ODBC Bridge client shared object (libesoobclient.so, the .so depends on the platform and may be .a or .sl). If the CUSTOM_ODBC_LIBS variable was not set BEFORE making PHP , Apache will not include a reference to the shared object containing the SQL functions and hence the undefined references. See the Apache_PHP text file in the docs directory of the distribution.
If you are not using a shell that allows variables to be assigned at the same time as running a command then set CUSTOM_ODBC_LIBS to -lesoobclient and then export CUSTOM_ODBC_LIBS. E.g.:
> CUSTOM_ODBC_LIBS="-lesoobclient" > export CUSTOM_ODBC_LIBS
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