The linux build document which comes with the scsl source bundle talks about building OJI plug-in library with GCC3.2, but there is no procedural details about how, to build OJI plug-in library.

README for linux need to include build procedure for OJI plug-in library.

OJI Plug-in library Compiled with GCC 3.2

      To support Mozilla compiled with GCC 3.2 on Linux platform, we need to
build OJI Plug-in library using GNU gcc/g++ compiler
      version 3.2.

      Case i: Using a single build system
      In this case, both default GCC (egcs 2.9.1.66) and GCC 3.2 are made to
co-exist by setting ALT_GCC32_COMPILER_PATH to the
      location of GCC 3.2 binary. You can obtain GCC 3.2 from
http://gcc.gnu.org.

      Case ii: Using two build systems
      In this case, you can build OJI Plug-in library in another system where
GCC 3.2 comes as default compiler such as RH 8.0 or above.
      After successfully build that library, set ALT_GCC32_PLUGIN_LIB_PATH to
point to the location of that library.