tmux error during make: compat.h:326: error: conflicting types for ‘forkpty’

[Neil Eldridge]

I'm hoping you can assist me in a make error on tmux.

I'm trying to compile tmux (on a SLES11.2 server in my homedir, without root access) but getting an error during the make command, and I'm hoping someone an point me in the right direction please!

Steps performed so far:

Downloaded:
* tmux-3.1b.tar.gz
* libevent-2.1.12-stable.tar.gz (prereq)
* ncurses-6.2-20200907 (prereq)
* pkgconfig

All of this seems to work so far:

#LIBEVENT
cd /home/neldrid/lib/libevent-2.1.12-stable
export PKG_CONFIG_PATH=/home/neldrid/lib/pkgconfig
./configure --prefix=/home/neldrid/lib/libevent --enable-shared
make
make install

# NCURSES
export PKG_CONFIG_PATH=/home/neldrid/lib/pkgconfig
./configure --prefix=/home/neldrid/lib/ncurses --with-shared --with-termlib --enable-pc-files --with-pkg-config-libdir=/home/neldrid/lib/pkgconfig

# TMUX
cd /home/neldrid/bin/tmux-3.1b
export PKG_CONFIG_PATH="/home/neldrid/lib/pkgconfig:/home/neldrid/lib/libevent/lib/pkgconfig"
export LIBNCURSES_CFLAGS=/home/neldrid/lib/ncurses/include/ncurses
export LIBNCURSES_LIBS=/home/neldrid/lib/ncurses/lib
export LIBEVENT_CFLAGS=/home/neldrid/lib/libevent/include
export LIBEVENT_LIBS=/home/neldrid/lib/libevent/lib
export LIBTINFO_CFLAGS=/home/neldrid/lib/libtinfo
export LIBTINFO_LIBS=/home/neldrid/lib/libtinfo
export LD_LIBRARY_PATH=/home/neldrid/lib/libevent/lib:/home/neldrid/lib/ncurses/lib:/home/neldrid/lib/libtinfo:/usr/lib:/usr/lib64

./configure --prefix=/home/neldrid/bin/tmux CPPFLAGS="-I/home/neldrid/lib/ncurses/include/ncurses -I/home/neldrid/lib/libevent/include -I/home/neldrid/lib/libtinfo"

So all of the above seems to work fine, but when I try to make, I get this:

> make
depbase=`echo alerts.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
        gcc -std=gnu99 -DPACKAGE_NAME=\"tmux\" -DPACKAGE_TARNAME=\"tmux\" -DPACKAGE_VERSION=\"3.1b\" -DPACKAGE_STRING=\"tmux\ 3.1b\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -DPACKAGE=\"tmux\" -DVERSION=\"3.1b\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -D__EXTENSIONS__=1 -D_ALL_SOURCE=1 -D_GNU_SOURCE=1 -D_POSIX_PTHREAD_SEMANTICS=1 -D_TANDEM_SOURCE=1 -DHAVE_DIRENT_H=1 -DHAVE_FCNTL_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_PATHS_H=1 -DHAVE_PTY_H=1 -DHAVE_STDINT_H=1 -DHAVE_SYS_DIR_H=1 -DHAVE_DIRFD=1 -DHAVE_FLOCK=1 -DHAVE_PRCTL=1 -DHAVE_SYSCONF=1 -DHAVE_ASPRINTF=1 -DHAVE_CFMAKERAW=1 -DHAVE_MEMMEM=1 -DHAVE_SETENV=1 -DHAVE_STRCASESTR=1 -DHAVE_STRNDUP=1 -DHAVE_STRSEP=1 -DHAVE_NCURSES_H=1 -DHAVE_PR_SET_NAME=1 -DHAVE_PROC_PID=1 -I.  -DTMUX_VERSION="\"3.1b\"" -DTMUX_CONF="\"/etc/tmux.conf:~/.tmux.conf:~/.config/tmux/tmux.conf\""  -iquote.     -I/home/neldrid/lib/ncurses/include/ncurses -I/home/neldrid/lib/libevent/include -I/home/neldrid/lib/libtinfo /home/neldrid/lib/ncurses/include/ncurses /home/neldrid/lib/libtinfo /home/neldrid/lib/libevent/include  -std=gnu99 -O2    -MT alerts.o -MD -MP -MF $depbase.Tpo -c -o alerts.o alerts.c &&\
        mv -f $depbase.Tpo $depbase.Po
In file included from tmux.h:36,
                 from alerts.c:24:
compat.h:326: error: conflicting types for ‘forkpty’
/usr/include/pty.h:40: error: previous declaration of ‘forkpty’ was here
make: *** [alerts.o] Error 1

I'm not sure what I need to provide but I'm happy to, and hope someone can point me in the right direction on where I'm going wrong!!

Thanks in advance!

[Scott Rochford]

I did a minimal installation of SLES 11.4 plus the development tools.

The supplied ncurses should be sufficient for tmux, do you really need to compile that?  pkgconfig likewise?

I had to compile libevent2 without openssl support (don't think it's needed for tmux anyway) as I didn't have the media or repo access to install the openssl development packages.

# libevent2

./configure --prefix=/home/anni --disable-openssl
make install

# tmux 3.1b

CFLAGS="-I /home/anni/include" LDFLAGS="-L/home/anni/lib" ./configure --prefix=/home/anni

make install

anni@sles11:~> LD_LIBRARY_PATH=/home/anni/lib tmux -V
tmux 3.1b

Regards,

Scott

[Nicholas Marriott]

forkpty error almost always means the configure tests are not linking. Look at config.log and see what errors the compiler is giving for the forkpty test.

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[Neil E]

Thanks very much for your responses and sorry for the delay. I will try that and let you know!