INFORMIXC environment variable (UNIX)

The INFORMIXC environment variable specifies the filename or pathname of the C compiler to be used to compile files that IBM® Informix® ESQL/C generates. The setting takes effect only during the C compilation stage.

If INFORMIXC is not set, the default compiler on most systems is cc.
Tip: On Windows, you pass either -mcc or -bcc options to the esql preprocessor to use either the Microsoft or Borland C compilers.
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>>-setenv--INFORMIXC--+-compiler-+-----------------------------><
                      '-pathname-'   

compiler
The file name of the C compiler.
pathname
The full path name of the C compiler.
For example, to specify the GNU C compiler, enter the following command:
setenv INFORMIXC gcc
Important: If you use gcc, be aware that the database server assumes that strings are writable, so you must compile by using the -fwritable-strings option. Failure to do so can produce unpredictable results, possibly including core dumps.