If the ServletExec installer failed to compile the mod_servletexec.c file then verify the compiler and link-editor specified by $CFG_CC and $CFG_LD_SHLIB in your apxs script are in your PATH. If they are then verify your apxs script doesn't begin with:
If it does then you need to install PERL on your system and you need to rebuild apxs as described below. If it doesn't then make sure it doesn't look as follows:
my $CFG_CFLAGS_SHLIB = ''; # substituted via Makefile.tmpl
my $CFG_LD_SHLIB = ''; # substituted via Makefile.tmpl
my $CFG_LDFLAGS_SHLIB = ''; # substituted via Makefile.tmpl
If it does then your apxs script needs to be updated. This occurs (often) when Apache is initially configured without shared module support (the default configuration) and then re-configured and rebuilt with shared module support. Since the makefile that creates apxs from apxs.pl depends only on the sources, apxs will not be updated when you re-configure. You should remove apxs from your source tree, remake and reinstall to get a fully configured/operational apxs. Note: you cannot remake and then copy the apxs--it is modified further in the configuration process.
To rebuild apxs from the source execute the following commands:
If your apxs script is correct and you are using the Sun compiler then the problem is mod_servletexec.c contains C++ style comments. To fix this edit your apxs script and add the -xCC option to the definition of $CFG_CFLAGS so that the Sun compiler will accept C++ style comments. Re-install ServletExec after making this change.
See Section 18.104.22.168 of the SE 5.0 Installation Guide for more details