configure on FreeBSD

I am working on resolving or explaining any anomalies in the configure script.
I am passing these options to configure:

/configure --prefix=$HOME/usr/local \
            --exec-prefix=$HOME/usr/local \
            --sysconfdir=/usr/local/etc \
            --with-build-cc=/usr/local/bin/gcc \
            --with-build-cflags="-lm" \
            --with-build-cppflags="-I/usr/include -I/usr/local/include" \
            --with-build-ldflags="-L/usr/lib -L/usr/local/lib" \
            --with-build-libs="/lib /usr/lib /usr/local/lib" \
            --with-iodbc=/usr/local/lib \
            --with-java=/usr/local/openjdk11 \
            --with-pgsqleng=/var/db/postgres/data11


The anomalies are:

. . .
checking for default SQLite odbc.ini entry... /etc/odbc.ini or ~/.odbc.ini not
found or not writable

On FreeBSD odbc.ini is found in /usr/local/etc/.  How do I tell configure to
find it?

. . .
Checking for MySQL client library support:
expr: illegal option -- L
expr: usage: expr [-e] expression

checking for mysql_stmt_close in -lmysqlclient... no
checking for mysql_stmt_close in -lmysqld... no
Missing MySQL client library file
checking MySQL client support... no
checking MySQL embedded support... no


MySQL-client is installed.  FreeBSD does not use bash as the default sh.  I can
change configure to use #!/usr/bin/env bash instead but within the script
itself it refers to bash explicitly.  In any case, the illegal option error is
still raised suggesting that it is contained in a subscript.  How is a solution
to this generalized?

. . .
Checking for PostgresSQL ESQL pre-compiler:
checking for ecpg... /usr/local/bin/ecpg
checking PG ESQL Informix compatibility... No-Invalid version number format-12.4
checking PG ESQL Informix compatibility... No-'informix' identifier not
found-12.4 ecpg
not allowed

I have no idea what this means or how to fix it.  PostgreSQL-client-12 is
installed on the build system.

. . .
Checking for PostgreSQL ODBC driver support:
LDFLAGS=-L/usr/lib
CPPFLAGS=-I/usr/include
checking for main in -lodbcpsql... no
checking for main in -lpsqlodbc... no
checking PG ODBC connector support... No -missing library

On FreeBSD these are called:
-rwxr-xr-x  1 root  wheel  513192 Dec 12 23:09 /usr/local/lib/psqlodbca.so
-rwxr-xr-x  1 root  wheel  541864 Dec 12 23:09 /usr/local/lib/psqlodbcw.so

How do I handle this in a generalized way so that the configure script is not
broken?  I presume that an addition to configure.in to test for FreeBSD is
required.  But I am not up to that task myself.  At least not yet.


And, I think that this message may contain a misspelling:

checking Aubit programs optimisation... No. -> Debuggig <- is enabled - set
DEBUG=ALL to get debug.out trace.