I have run into an issue attempting to build the CPAN module Newt-1.08. The Newt.xs/Newt.c module fails compilation. A project I have been trying to port uses Newt.

The system is running Redhat EL6, the compiler is gcc 4.4.7. Here is the relevant error message:

gcc -c   -D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack
+-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BI
+TS=64 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack
+-protector --param=ssp-buffer-size=4 -m64 -mtune=generic   -DVERSION=
+\"1.08\" -DXS_VERSION=\"1.08\" -fPIC "-I/usr/lib64/perl5/CORE"   Newt
+.c
Newt.xs: In function âconstantâ:
Newt.xs:99: warning: âreturnâ with no value, in function returning non
+-void
Newt.xs:658: warning: label ânot_thereâ defined but not used
Newt.c: In function âXS_Newt_va_endâ:
Newt.c:765: error: cast specifies array type
Newt.c: In function âXS_Newt_newtFormRunâ:
Newt.xs:1041: warning: unused variable âsvâ
Newt.c: In function âXS_Newt_newtButtonBarvâ:
Newt.c:3442: error: cast specifies array type
Newt.c: In function âXS_Newt_newtWinMessagevâ:
Newt.c:3528: error: cast specifies array type
make: *** [Newt.o] Error 1
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The portion of the Newt.c program relevant to the first error at line 765 is (actual error is set off with dashes):

XS(XS_Newt_va_end); /* prototype to pass -Wmissing-prototypes */
XS(XS_Newt_va_end)
{
#ifdef dVAR
    dVAR; dXSARGS;
#else
    dXSARGS;
#endif
    if (items != 1)
       croak_xs_usage(cv,  "arg0");
    {
        __gnuc_va_list  arg0;
--------------------------
        if (sv_derived_from(ST(0), "__gnuc_va_list")) {
            IV tmp = SvIV((SV*)SvRV(ST(0)));
            arg0 = INT2PTR(__gnuc_va_list,tmp);
--------------------------
        }
        else
            Perl_croak(aTHX_ "%s: %s is not of type %s",
                        "Newt::va_end",
                        "arg0", "__gnuc_va_list");

        va_end(arg0);
    }
    XSRETURN_EMPTY;
}
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So how did this compile in the first place? I am just not seeing what I'm doing wrong.