rlm_sql_unixodbc ?

[Jim Rice]

After installing mysql-connector-odbc,
running ./configure within rlm_sql_unixodbc it was then able to find:
checking for SQLConnect in -lodbc... yes

But not:
checking for sql.h... no
configure: WARNING: silently not building rlm_sql_unixodbc.
configure: WARNING: FAILURE: rlm_sql_unixodbc requires: sql.h.

I ran a find for sql.h and it is not in /usr.

And neither pkg exists for mysql-connector-odbc-devel nor 
mysql-connector-odbc-dev.

There is this:
/usr/local/src/freeradius-server-2.1.10/src/modules/rlm_sql/rlm_sql.h

Still not sure how to resolve this.