Dirk, I did not realize libiodbc[1] is an 
alternative to unixODBC, how are you 
able to see this?  

I also did not realize I had both of 
them installed ... 

Uninstalling libiodbc, keeping unixODBC, 
adding the flag (I only suppose this is 
how the flag is added), does nothing:

        rasmus@iselin ~/src/RODBC % R CMD INSTALL RODBC --with-odbc-manager=odbc
        Warning: unknown option ‘--with-odbc-manager=odbc’
        * installing to library 
‘/usr/home/rasmus/R/amd64-portbld-freebsd13.0-library/4.0’
        * installing *source* package ‘RODBC’ ...
        files ‘configure’, ‘configure.ac’ have the wrong MD5 checksums
        ** using staged installation
        checking for gcc... cc
        checking whether the C compiler works... yes
        checking for C compiler default output file name... a.out
        checking for suffix of executables...
        checking whether we are cross compiling... no
        checking for suffix of object files... o
        checking whether we are using the GNU C compiler... yes
        checking whether cc accepts -g... yes
        checking for cc option to accept ISO C89... none needed
        checking how to run the C preprocessor... cc -E
        checking for grep that handles long lines and -e... /usr/bin/grep
        checking for egrep... /usr/bin/grep -E
        checking for ANSI C header files... yes
        checking for sys/types.h... yes
        checking for sys/stat.h... yes
        checking for stdlib.h... yes
        checking for string.h... yes
        checking for memory.h... yes
        checking for strings.h... yes
        checking for inttypes.h... yes
        checking for stdint.h... yes
        checking for unistd.h... yes
        checking sql.h usability... yes
        checking sql.h presence... yes
        checking for sql.h... yes
        checking sqlext.h usability... yes
        checking sqlext.h presence... yes
        checking for sqlext.h... yes
        checking for library containing SQLTables... no
        configure: error: "no ODBC driver manager found"
        ERROR: configuration failed for package ‘RODBC’
        * removing 
‘/usr/home/rasmus/R/amd64-portbld-freebsd13.0-library/4.0/RODBC’

The other way around, uninstalling 
unixODBC, keeping libiodbc, brings me 
one step backwards: 

        rasmus@iselin ~/src/RODBC % R CMD INSTALL RODBC 
--with-odbc-manager=iodbc
        Warning: unknown option ‘--with-odbc-manager=iodbc’
        * installing to library 
‘/usr/home/rasmus/R/amd64-portbld-freebsd13.0-library/4.0’
        * installing *source* package ‘RODBC’ ...
        files ‘configure’, ‘configure.ac’ have the wrong MD5 checksums
        ** using staged installation
        checking for gcc... cc
        checking whether the C compiler works... yes
        checking for C compiler default output file name... a.out
        checking for suffix of executables...
        checking whether we are cross compiling... no
        checking for suffix of object files... o
        checking whether we are using the GNU C compiler... yes
        checking whether cc accepts -g... yes
        checking for cc option to accept ISO C89... none needed
        checking how to run the C preprocessor... cc -E
        checking for grep that handles long lines and -e... /usr/bin/grep
        checking for egrep... /usr/bin/grep -E
        checking for ANSI C header files... yes
        checking for sys/types.h... yes
        checking for sys/stat.h... yes
        checking for stdlib.h... yes
        checking for string.h... yes
        checking for memory.h... yes
        checking for strings.h... yes
        checking for inttypes.h... yes
        checking for stdint.h... yes
        checking for unistd.h... yes
        checking sql.h usability... no
        checking sql.h presence... no
        checking for sql.h... no
        checking sqlext.h usability... no
        checking sqlext.h presence... no
        checking for sqlext.h... no
        configure: error: "ODBC headers sql.h and sqlext.h not found"
        ERROR: configuration failed for package ‘RODBC’
        * removing 
‘/usr/home/rasmus/R/amd64-portbld-freebsd13.0-library/4.0/RODBC’

... the sql.h and sqlext.h header files 
are there, libiodbc provides them both:

        root@iselin /usr/home/rasmus # pkg info -l libiodbc | egrep 
'sql.h|sqlext.h'
                /usr/local/include/libiodbc/isql.h
                /usr/local/include/libiodbc/isqlext.h
                /usr/local/include/libiodbc/sql.h
                /usr/local/include/libiodbc/sqlext.h

... also when having unixodbc installed:

        root@iselin /usr/home/rasmus # pkg info -l unixODBC-2.3.9 | egrep 
'sql.h|sqlext.h'
                /usr/local/include/sql.h
                /usr/local/include/sqlext.h

Rasmus

[1] https://www.freshports.org/databases/libiodbc/

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