Determining if the include file pthread.h exists failed with the following output:
Change Dir: /nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_d7fe0/fast && make[1]: Entering directory '/nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_d7fe0.dir/build.make CMakeFiles/cmTC_d7fe0.dir/build
make[2]: Entering directory '/nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_d7fe0.dir/CheckIncludeFile.c.o
/nvmedata/autobuild/instance-9/output-1/host/bin/mips64el-buildroot-linux-uclibc-gcc --sysroot=/nvmedata/autobuild/instance-9/output-1/host/mips64el-buildroot-linux-uclibc/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O1 -g0 -static   -DNDEBUG -o CMakeFiles/cmTC_d7fe0.dir/CheckIncludeFile.c.o -c /nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: pthread.h: No such file or directory
    1 | #include <pthread.h>
      |          ^~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/cmTC_d7fe0.dir/build.make:85: CMakeFiles/cmTC_d7fe0.dir/CheckIncludeFile.c.o] Error 1
make[2]: Leaving directory '/nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:140: cmTC_d7fe0/fast] Error 2
make[1]: Leaving directory '/nvmedata/autobuild/instance-9/output-1/build/libuhttpd-3.14.1/CMakeFiles/CMakeTmp'