I've recently installed Inline::C on Gutsy Gibbon (Ubuntu 7.10) and have written a test program: 
use strict;
use Inline (
    C => 'DATA'
);

print add(3, 5);

1;

__DATA__
__C__
int add(int x, int y) {
    return x + y;
}

[download]
When run, it gives me the following output in STDERR: 

/usr/bin/perl /usr/share/perl/5.8/ExtUtils/xsubpp  -typemap /usr/share
+/perl/5.8/ExtUtils/typemap   inline_C_test_pl_6d69.xs > inline_C_test
+_pl_6d69.xsc && mv inline_C_test_pl_6d69.xsc inline_C_test_pl_6d69.c
cc -c  -I/home/phil/jobs/perl -D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAV
+E_PIDS -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LA
+RGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2   -DVERSION=\"0.00\" -DXS_V
+ERSION=\"0.00\" -fPIC "-I/usr/lib/perl/5.8/CORE"   inline_C_test_pl_6
+d69.c
In file included from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perl.h:420:24: error: sys/types.h: No such file
+ or directory
/usr/lib/perl/5.8/CORE/perl.h:451:19: error: ctype.h: No such file or 
+directory
/usr/lib/perl/5.8/CORE/perl.h:463:23: error: locale.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/perl.h:480:20: error: setjmp.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/perl.h:486:26: error: sys/param.h: No such file
+ or directory
/usr/lib/perl/5.8/CORE/perl.h:491:23: error: stdlib.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/perl.h:496:23: error: unistd.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/perl.h:776:23: error: string.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/perl.h:925:27: error: netinet/in.h: No such fil
+e or directory
/usr/lib/perl/5.8/CORE/perl.h:929:26: error: arpa/inet.h: No such file
+ or directory
/usr/lib/perl/5.8/CORE/perl.h:939:25: error: sys/stat.h: No such file 
+or directory
/usr/lib/perl/5.8/CORE/perl.h:961:21: error: time.h: No such file or d
+irectory
/usr/lib/perl/5.8/CORE/perl.h:968:25: error: sys/time.h: No such file 
+or directory
/usr/lib/perl/5.8/CORE/perl.h:975:27: error: sys/times.h: No such file
+ or directory
/usr/lib/perl/5.8/CORE/perl.h:982:19: error: errno.h: No such file or 
+directory
/usr/lib/perl/5.8/CORE/perl.h:997:25: error: sys/socket.h: No such fil
+e or directory
/usr/lib/perl/5.8/CORE/perl.h:1024:21: error: netdb.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/perl.h:1127:24: error: sys/ioctl.h: No such fil
+e or directory
/usr/lib/perl/5.8/CORE/perl.h:1156:23: error: dirent.h: No such file o
+r directory
In file included from /usr/lib/gcc/i486-linux-gnu/4.1.3/include/syslim
+its.h:7,
                 from /usr/lib/gcc/i486-linux-gnu/4.1.3/include/limits
+.h:11,
                 from /usr/lib/perl/5.8/CORE/perl.h:1510,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/gcc/i486-linux-gnu/4.1.3/include/limits.h:122:61: error: limi
+ts.h: No such file or directory
In file included from /usr/lib/perl/5.8/CORE/perl.h:2120,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/handy.h:136:25: error: inttypes.h: No such file
+ or directory
In file included from /usr/lib/perl/5.8/CORE/perl.h:2284,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/unixish.h:106:21: error: signal.h: No such file
+ or directory
In file included from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perl.h:2421:33: error: pthread.h: No such file 
+or directory
In file included from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perl.h:2423: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘perl_os_thread’
/usr/lib/perl/5.8/CORE/perl.h:2424: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘perl_mutex’
/usr/lib/perl/5.8/CORE/perl.h:2425: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘perl_cond’
/usr/lib/perl/5.8/CORE/perl.h:2426: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘perl_key’
In file included from /usr/lib/perl/5.8/CORE/iperlsys.h:51,
                 from /usr/lib/perl/5.8/CORE/perl.h:2733,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perlio.h:65:19: error: stdio.h: No such file or
+ directory
In file included from /usr/lib/perl/5.8/CORE/iperlsys.h:51,
                 from /usr/lib/perl/5.8/CORE/perl.h:2733,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perlio.h:259: error: expected ‘)’ b
+efore ‘*’ token
/usr/lib/perl/5.8/CORE/perlio.h:262: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/perlio.h:265: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/perlio.h:268: error: expected declaration speci
+fiers or ‘...’ before ‘FILE’
In file included from /usr/lib/perl/5.8/CORE/perl.h:2747,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/sv.h:389: error: expected specifier-qualifier-l
+ist before ‘DIR’
In file included from /usr/lib/perl/5.8/CORE/op.h:497,
                 from /usr/lib/perl/5.8/CORE/perl.h:2754,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/reentr.h:72:20: error: pwd.h: No such file or d
+irectory
/usr/lib/perl/5.8/CORE/reentr.h:75:20: error: grp.h: No such file or d
+irectory
/usr/lib/perl/5.8/CORE/reentr.h:85:26: error: crypt.h: No such file or
+ directory
/usr/lib/perl/5.8/CORE/reentr.h:90:27: error: shadow.h: No such file o
+r directory
In file included from /usr/lib/perl/5.8/CORE/op.h:497,
                 from /usr/lib/perl/5.8/CORE/perl.h:2754,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/reentr.h:612: error: field ‘_crypt_struct
+’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:620: error: field ‘_drand48_stru
+ct’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:624: error: field ‘_grent_struct
+’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:635: error: field ‘_hostent_stru
+ct’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:654: error: field ‘_netent_struc
+t’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:669: error: field ‘_protoent_str
+uct’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:684: error: field ‘_pwent_struct
+’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:695: error: field ‘_servent_stru
+ct’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:710: error: field ‘_spent_struct
+’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:721: error: field ‘_gmtime_struc
+t’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:724: error: field ‘_localtime_st
+ruct’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:771: error: field ‘_random_struc
+t’ has incomplete type
/usr/lib/perl/5.8/CORE/reentr.h:772: error: expected specifier-qualifi
+er-list before ‘int32_t’
In file included from /usr/lib/perl/5.8/CORE/perl.h:2756,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/av.h:13: error: expected specifier-qualifier-li
+st before ‘ssize_t’
In file included from /usr/lib/perl/5.8/CORE/perl.h:2759,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/scope.h:232: error: expected specifier-qualifie
+r-list before ‘sigjmp_buf’
In file included from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perl.h:2931: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘getuid’
/usr/lib/perl/5.8/CORE/perl.h:2932: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘geteuid’
/usr/lib/perl/5.8/CORE/perl.h:2933: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘getgid’
/usr/lib/perl/5.8/CORE/perl.h:2934: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘getegid’
In file included from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perl.h:3238:22: error: math.h: No such file or 
+directory
In file included from /usr/lib/perl/5.8/CORE/perl.h:3881,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/thrdvar.h:85: error: field ‘Tstatbuf&#821
+7; has incomplete type
/usr/lib/perl/5.8/CORE/thrdvar.h:86: error: field ‘Tstatcache&#8
+217; has incomplete type
/usr/lib/perl/5.8/CORE/thrdvar.h:91: error: field ‘Ttimesbuf&#82
+17; has incomplete type
In file included from /usr/lib/perl/5.8/CORE/perl.h:3883,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/intrpvar.h:66: error: expected specifier-qualif
+ier-list before ‘time_t’
In file included from /usr/lib/perl/5.8/CORE/perl.h:3950,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/proto.h:128: error: expected declaration specif
+iers or ‘...’ before ‘mode_t’
/usr/lib/perl/5.8/CORE/proto.h:128: error: expected declaration specif
+iers or ‘...’ before ‘uid_t’
/usr/lib/perl/5.8/CORE/proto.h:297: error: expected declaration specif
+iers or ‘...’ before ‘off64_t’
/usr/lib/perl/5.8/CORE/proto.h:299: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘Perl_do_sysseek’
/usr/lib/perl/5.8/CORE/proto.h:300: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘Perl_do_tell’
/usr/lib/perl/5.8/CORE/proto.h:411: error: expected declaration specif
+iers or ‘...’ before ‘gid_t’
/usr/lib/perl/5.8/CORE/proto.h:411: error: expected declaration specif
+iers or ‘...’ before ‘uid_t’
/usr/lib/perl/5.8/CORE/proto.h:736: error: expected ‘=’, &
+#8216;,’, ‘;’, ‘asm’ or ‘__attrib
+ute__’ before ‘Perl_my_fork’
/usr/lib/perl/5.8/CORE/proto.h:1020: error: expected declaration speci
+fiers or ‘...’ before ‘pid_t’
/usr/lib/perl/5.8/CORE/proto.h:1300: error: expected declaration speci
+fiers or ‘...’ before ‘pid_t’
/usr/lib/perl/5.8/CORE/proto.h:1456: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/proto.h:2001: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘Perl_PerlIO_read’
/usr/lib/perl/5.8/CORE/proto.h:2002: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘Perl_PerlIO_write’
/usr/lib/perl/5.8/CORE/proto.h:2003: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘Perl_PerlIO_unread’
/usr/lib/perl/5.8/CORE/proto.h:2004: error: expected ‘=’, 
+‘,’, ‘;’, ‘asm’ or ‘__attri
+bute__’ before ‘Perl_PerlIO_tell’
/usr/lib/perl/5.8/CORE/proto.h:2005: error: expected declaration speci
+fiers or ‘...’ before ‘off64_t’
In file included from /usr/lib/perl/5.8/CORE/perl.h:3988,
                 from inline_C_test_pl_6d69.xs:2:
/usr/lib/perl/5.8/CORE/perlvars.h:31: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘PL_thr_key’
/usr/lib/perl/5.8/CORE/perlvars.h:48: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘PL_op_mutex’
/usr/lib/perl/5.8/CORE/perlvars.h:52: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘PL_dollarzero_mutex’
/usr/lib/perl/5.8/CORE/perl.h:4485:24: error: sys/ipc.h: No such file 
+or directory
/usr/lib/perl/5.8/CORE/perl.h:4486:24: error: sys/sem.h: No such file 
+or directory
/usr/lib/perl/5.8/CORE/perl.h:4611:24: error: sys/file.h: No such file
+ or directory
In file included from /usr/lib/perl/5.8/CORE/perlapi.h:38,
                 from /usr/lib/perl/5.8/CORE/XSUB.h:349,
                 from inline_C_test_pl_6d69.xs:3:
/usr/lib/perl/5.8/CORE/intrpvar.h:66: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/intrpvar.h:237: error: expected ‘=’
+, ‘,’, ‘;’, ‘asm’ or ‘__att
+ribute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/intrpvar.h:238: error: expected ‘=’
+, ‘,’, ‘;’, ‘asm’ or ‘__att
+ribute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/intrpvar.h:239: error: expected ‘=’
+, ‘,’, ‘;’, ‘asm’ or ‘__att
+ribute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/intrpvar.h:240: error: expected ‘=’
+, ‘,’, ‘;’, ‘asm’ or ‘__att
+ribute__’ before ‘*’ token
In file included from /usr/lib/perl/5.8/CORE/perlapi.h:39,
                 from /usr/lib/perl/5.8/CORE/XSUB.h:349,
                 from inline_C_test_pl_6d69.xs:3:
/usr/lib/perl/5.8/CORE/perlvars.h:31: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/perlvars.h:48: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘*’ token
/usr/lib/perl/5.8/CORE/perlvars.h:52: error: expected ‘=’,
+ ‘,’, ‘;’, ‘asm’ or ‘__attr
+ibute__’ before ‘*’ token
inline_C_test_pl_6d69.c: In function ‘XS_main_add’:
inline_C_test_pl_6d69.c:23: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:23: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:23: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:25: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:27: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:27: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:27: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:27: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:28: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:28: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:28: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:28: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:30: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:30: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:30: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:30: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:33: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:33: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:33: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:35: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:35: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c: In function ‘boot_inline_C_test_pl_6d69
+’:
inline_C_test_pl_6d69.c:44: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:44: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:44: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:47: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:49: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:50: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:50: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:50: error: invalid type argument of ‘una
+ry *’
inline_C_test_pl_6d69.c:50: error: invalid type argument of ‘una
+ry *’
make: *** [inline_C_test_pl_6d69.o] Error 1

A problem was encountered while attempting to compile and install your
+ Inline
C code. The command that failed was:
  make > out.make 2>&1

The build directory was:
/home/phil/jobs/perl/_Inline/build/inline_C_test_pl_6d69

To debug the problem, cd to the build directory, and inspect the outpu
+t files.

 at inline_C_test.pl line 0
INIT failed--call queue aborted.

[download]

(Sorry about the UTF-8 characters. They don't display properly in Konqueror.) Anyway, what do I need to do to get this working? Thanks.

In reply to Problems with Inline::C on Ubuntu by Dr. Mu

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