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I revisit this every time I need to extract something from a .eml and still no luck

Both adding CFLAGS='-fpermissive' in front of the build ./configure and using the alternative debian package PKGBUILD fail :

codes.c:107:5: error: too many arguments to function 'MD5Final'; expected 0, have 2
codes.c:130:5: error: too many arguments to function 'MD5Init'; expected 0, have 1
codes.c:133:9: error: too many arguments to function 'MD5Update'; expected 0, have 3


Linux 6.14.7-arch2-1 #1 SMP PREEMPT_DYNAMIC Thu, 22 May 2025 05:37:49 +0000 x86_64 GNU/Linux
gcc version 15.1.1 20250425 (GCC)

or more detailed:

creating Makefile
gcc -DPACKAGE=\"mpack\" -DVERSION=\"1.6\" -DHAVE_DN_EXPAND=1 -DHAVE_STRCHR=1 -DHAVE_STRCASECMP=1 -DHAVE_GETOPT=1  -I. -I.      -fpermissive -c unixpk.c
gcc -DPACKAGE=\"mpack\" -DVERSION=\"1.6\" -DHAVE_DN_EXPAND=1 -DHAVE_STRCHR=1 -DHAVE_STRCASECMP=1 -DHAVE_GETOPT=1  -I. -I.      -fpermissive -c encode.c
gcc -DPACKAGE=\"mpack\" -DVERSION=\"1.6\" -DHAVE_DN_EXPAND=1 -DHAVE_STRCHR=1 -DHAVE_STRCASECMP=1 -DHAVE_GETOPT=1  -I. -I.      -fpermissive -c codes.c
gcc -DPACKAGE=\"mpack\" -DVERSION=\"1.6\" -DHAVE_DN_EXPAND=1 -DHAVE_STRCHR=1 -DHAVE_STRCASECMP=1 -DHAVE_GETOPT=1  -I. -I.      -fpermissive -c magic.c

codes.c: In function 'md5contextTo64':
codes.c:107:5: error: too many arguments to function 'MD5Final'; expected 0, have 2
  107 |     MD5Final(digest, context);
      |     ^~~~~~~~ ~~~~~~
In file included from codes.c:42:
md5.h:68:6: note: declared here
   68 | void MD5Final PROTO_LIST ((unsigned char [16], MD5_CTX *));
      |      ^~~~~~~~
codes.c: In function 'md5digest':
codes.c:130:5: error: too many arguments to function 'MD5Init'; expected 0, have 1
  130 |     MD5Init(&context);
      |     ^~~~~~~ ~~~~~~~~
md5.h:65:6: note: declared here
   65 | void MD5Init PROTO_LIST ((MD5_CTX *));
      |      ^~~~~~~
codes.c:133:9: error: too many arguments to function 'MD5Update'; expected 0, have 3
  133 |         MD5Update(&context, buf, nbytes);
      |         ^~~~~~~~~ ~~~~~~~~
md5.h:66:6: note: declared here
   66 | void MD5Update PROTO_LIST
      |      ^~~~~~~~~
make: *** [Makefile:168: codes.o] Error 1
make: *** Waiting for unfinished jobs....
==> ERROR: A failure occurred in build().
    Aborting...

If anyone wants to adopt this package, here is a working PKGBUILD with more patches from Debian:

pkgname=mpack
pkgver=1.6
pkgrel=6
pkgrel_debian=18
pkgdesc='Utilities for encoding and decoding binaries files in MIME format mail messages'
arch=('i686' 'x86_64')
url='http://ftp.andrew.cmu.edu/pub/mpack/'
license=('GPL')
source=("https://salsa.debian.org/debian/mpack/-/archive/debian/${pkgver}-${pkgrel_debian}/${pkgname}-debian-${pkgver}-${pkgrel_debian}.tar.gz")
sha256sums=('b3b8adc8cb4e7523f8d0c5a92d10b5b3ad7e1997665297519c4b34a4c7b9469a')

prepare(){
    cd ${srcdir}/${pkgname}-debian-${pkgver}-${pkgrel_debian}

    for patchfile in debian/patches/*.patch; do
        if [ "${patchfile}" != "debian/patches/06_fix-makefile.patch" ]; then
            patch -p1 -N < "${patchfile}"
        fi
    done
}

build() {
    cd ${srcdir}/${pkgname}-debian-${pkgver}-${pkgrel_debian}

    CFLAGS='-fpermissive' ./configure --prefix=/usr --mandir=/usr/share/man
    make
}

package() {
    cd ${srcdir}/${pkgname}-debian-${pkgver}-${pkgrel_debian}

    make DESTDIR=${pkgdir} install
}

I found a fix for the problem of @akarshsimha and @akaitea. You have to add the following line to the top of the configure file in src dir

CFLAGS='-fpermissive'

I had the same problem as @akaitea. Running makepkg with CFLAGS='-fpermissive' on the command line did nothing. Based on the configure step that fails, i.e.

checking whether the C compiler (gcc -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now) works... no
configure: error: installation or configuration problem: C compiler cannot create executables.
==> ERROR: A failure occurred in build().
    Aborting...

I tried executing gcc with the same arguments (I've shown it with -fpermissive added, which seems to have no positive effect on this problem):

gcc -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -Wl -O1 --sort-common --as-needed -z relro -z now -fpermissive
gcc: error: unrecognized command-line option ‘-Wl’; did you mean ‘-W’?
gcc: error: unrecognized command-line option ‘--sort-common’; did you mean ‘--no-common’?
gcc: error: unrecognized command-line option ‘--as-needed’; did you mean ‘-mno-needed’?
gcc: fatal error: no input files
compilation terminated.

So it looks like --sort-common , -Wl and --as-needed arguments are not understood by the compiler. Now if I instead run clang:

clang -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -Wl -O1 --sort-common --as-needed -z relro -z now -fpermissive
clang: error: unknown argument: '--sort-common'
clang: error: unknown argument: '--as-needed'

Please ignore my last post, it was an issue with my fstab mounting ("noexec"). Sorry for the confusion.

There are some awkward permission errors when trying to make this package:

$ makepkg
==> Making package: mpack 1.6-5 (Sun 08 Sep 2024 01:39:39 AM CEST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
-> Downloading mpack-1.6.tar.gz...
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
100  175k  100  175k    0     0   583k      0 --:--:-- --:--:-- --:--:--  583k
-> Found gcc4-fixes.patch
==> Validating source files with sha256sums...
    mpack-1.6.tar.gz ... Passed
    gcc4-fixes.patch ... Passed
==> Extracting sources...
-> Extracting mpack-1.6.tar.gz with bsdtar
==> Starting prepare()...
patching file unixos.c
patching file unixpk.c
File unixunpk.c is read-only; trying to patch anyway
patching file unixunpk.c
File xmalloc.c is read-only; trying to patch anyway
patching file xmalloc.c
==> Starting build()...
/home/drtebi/Downloads/mpack/PKGBUILD: line 29: ./configure: Permission denied
==> ERROR: A failure occurred in build().
    Aborting...

Would be great if this could be fixed.

@akaitea Add -fpermissive to your CFLAGS. This is caused by breaking change in gcc 14 from 13. See https://forum.nim-lang.org/t/11587 where this was a problem.

can't get it to makepkg:

checking whether the C compiler (gcc -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection -Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now) works... no
configure: error: installation or configuration problem: C compiler cannot create executables.
==> ERROR: A failure occurred in build().

on:

Linux 6.8.9-arch1-2 #1 SMP PREEMPT_DYNAMIC Tue, 07 May 2024 21:35:54 +0000 x86_64 GNU/Linux

gcc version 14.1.1 20240507 (GCC)

looked around online for possible solutions to the error message but no luck

The site operator has unblocked curl on my request, so no further action is required.