Performing C SOURCE FILE Test CMAKE_HAVE_LIBC_PTHREAD failed with the following output:
Change Dir: /var/tmp/portage/www-servers/pound-3.0/work/pound-3.0_build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_db56a && [1/2] Building C object CMakeFiles/cmTC_db56a.dir/src.c.o
[2/2] Linking C executable cmTC_db56a
FAILED: cmTC_db56a 
: && /usr/bin/x86_64-pc-linux-gnu-gcc -pipe -march=native -fno-diagnostics-color -O2 -Wno-unused-result -Wno-cast-qual -Wno-discarded-qualifiers -D_GNU_SOURCE -O2 -Wl,-O1 -Wl,--as-needed -Wl,--defsym=__gentoo_check_ldflags__=0   -rdynamic CMakeFiles/cmTC_db56a.dir/src.c.o -o cmTC_db56a   && :
/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../x86_64-pc-linux-gnu/bin/ld: CMakeFiles/cmTC_db56a.dir/src.c.o: in function `main':
src.c:(.text.startup+0x23): undefined reference to `pthread_create'
/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../x86_64-pc-linux-gnu/bin/ld: src.c:(.text.startup+0x2c): undefined reference to `pthread_detach'
/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../x86_64-pc-linux-gnu/bin/ld: src.c:(.text.startup+0x35): undefined reference to `pthread_cancel'
/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/../../../../x86_64-pc-linux-gnu/bin/ld: src.c:(.text.startup+0x40): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.


Source file was:
#include <pthread.h>

static void* test_func(void* data)
{
  return data;
}

int main(void)
{
  pthread_t thread;
  pthread_create(&thread, NULL, test_func, NULL);
  pthread_detach(thread);
  pthread_cancel(thread);
  pthread_join(thread, NULL);
  pthread_atfork(NULL, NULL, NULL);
  pthread_exit(NULL);

  return 0;
}

Determining if files stdio.h;pthread.h;yaml.h;nanomsg/nn.h;nanomsg/inproc.h;nanomsg/pipeline.h;nanomsg/pair.h;nanomsg/reqrep.h;stdlib.h;unistd.h;fcntl.h;ctype.h;getopt.h;string.h;syslog.h;sys/types.h;sys/socket.h;netdb.h;sys/stat.h;time.h;poll.h;semaphore.h;pwd.h;grp.h;signal.h;setjmp.h;mbedtls/config.h;mbedtls/certs.h;mbedtls/oid.h;mbedtls/asn1.h;mbedtls/x509.h;mbedtls/entropy.h;mbedtls/ctr_drbg.h;mbedtls/ssl.h;mbedtls/error.h exist failed with the following output:
Change Dir: /var/tmp/portage/www-servers/pound-3.0/work/pound-3.0_build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_6c07f && [1/2] Building C object CMakeFiles/cmTC_6c07f.dir/HAVE_MANDATORY_INCLUDES.c.o
FAILED: CMakeFiles/cmTC_6c07f.dir/HAVE_MANDATORY_INCLUDES.c.o 
/usr/bin/x86_64-pc-linux-gnu-gcc    -pipe -march=native -fno-diagnostics-color -O2 -Wno-unused-result -Wno-cast-qual -Wno-discarded-qualifiers -D_GNU_SOURCE -O2 -o CMakeFiles/cmTC_6c07f.dir/HAVE_MANDATORY_INCLUDES.c.o -c /var/tmp/portage/www-servers/pound-3.0/work/pound-3.0_build/CMakeFiles/CheckIncludeFiles/HAVE_MANDATORY_INCLUDES.c
/var/tmp/portage/www-servers/pound-3.0/work/pound-3.0_build/CMakeFiles/CheckIncludeFiles/HAVE_MANDATORY_INCLUDES.c:28:10: fatal error: mbedtls/config.h: No such file or directory
   28 | #include <mbedtls/config.h>
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.


Source:
/* */
#include <stdio.h>
#include <pthread.h>
#include <yaml.h>
#include <nanomsg/nn.h>
#include <nanomsg/inproc.h>
#include <nanomsg/pipeline.h>
#include <nanomsg/pair.h>
#include <nanomsg/reqrep.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <getopt.h>
#include <string.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <sys/stat.h>
#include <time.h>
#include <poll.h>
#include <semaphore.h>
#include <pwd.h>
#include <grp.h>
#include <signal.h>
#include <setjmp.h>
#include <mbedtls/config.h>
#include <mbedtls/certs.h>
#include <mbedtls/oid.h>
#include <mbedtls/asn1.h>
#include <mbedtls/x509.h>
#include <mbedtls/entropy.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/ssl.h>
#include <mbedtls/error.h>


int main(void){return 0;}