these derivations will be built:
  /nix/store/v7b3lws7r3y941lv4gryfrap3w0rfg8z-emacs-libvterm-unstable-2017-11-24.drv
  /nix/store/n9sa5cakss1z3kl7jl4j5l6m6hjlxlld-emacs-packages-deps.drv
  /nix/store/jg6wgzq51mnbfh7qxldpr3bsm4y30mb8-emacs-with-packages-25.3.drv
  /nix/store/p3fkljz8qbg7da96kplwdsipxwcjijjf-home-manager-path.drv
  /nix/store/73341xgyrfk6i5ix2jwydnj9xiiswh63-activation-script.drv
  /nix/store/hbww6f9633bv72md22s668hgdwcgpwdb-home-manager-generation.drv
building '/nix/store/v7b3lws7r3y941lv4gryfrap3w0rfg8z-emacs-libvterm-unstable-2017-11-24.drv'...
unpacking sources
unpacking source archive /nix/store/4170iccdbl7dzsg0kj8m6h2ym4lq4w48-source
source root is source
patching sources
configuring
fixing cmake files...
cmake flags: -DCMAKE_BUILD_TYPE=Release -DCMAKE_SKIP_BUILD_RPATH=ON -DCMAKE_INSTALL_INCLUDEDIR=/nix/store/5alkkbhl5n7n4507dw0ja6mz01x95c78-emacs-libvterm-unstable-2017-11-24/include -DCMAKE_INSTALL_LIBDIR=/nix/store/5alkkbhl5n7n4507dw0ja6mz01x95c78-emacs-libvterm-unstable-2017-11-24/lib -DCMAKE_INSTALL_NAME_DIR=/nix/store/5alkkbhl5n7n4507dw0ja6mz01x95c78-emacs-libvterm-unstable-2017-11-24/lib -DCMAKE_POLICY_DEFAULT_CMP0025=NEW -DCMAKE_OSX_DEPLOYMENT_TARGET= -DCMAKE_OSX_SYSROOT= -DCMAKE_FIND_FRAMEWORK=last -DCMAKE_INSTALL_PREFIX=/nix/store/5alkkbhl5n7n4507dw0ja6mz01x95c78-emacs-libvterm-unstable-2017-11-24 -DEMACS_SOURCE=/nix/store/5xa7mhmrn23ac0fn3fdy7d16cdh75fj9-emacs-25.3-sources
-- The C compiler identification is GNU 7.3.0
-- Check for working C compiler: /nix/store/487kalv9jm8g5fs3bm5yhby63mcpnbfv-gcc-wrapper-7.3.0/bin/gcc
-- Check for working C compiler: /nix/store/487kalv9jm8g5fs3bm5yhby63mcpnbfv-gcc-wrapper-7.3.0/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_INSTALL_INCLUDEDIR
    CMAKE_INSTALL_LIBDIR
    CMAKE_POLICY_DEFAULT_CMP0025


-- Build files have been written to: /build/source/build
cmake: enabled parallel building
building
build flags: -j1 -l1 SHELL=/nix/store/xn5gv3lpfy91yvfy9b0i7klfcxh9xskz-bash-4.4-p19/bin/bash
Scanning dependencies of target vterm-module
[ 25%] Building C object CMakeFiles/vterm-module.dir/vterm-module.c.o
/build/source/vterm-module.c: In function 'term_flush_output':
/build/source/vterm-module.c:197:5: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
     write(term->masterfd, buffer, bufflen);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 50%] Building C object CMakeFiles/vterm-module.dir/utf8.c.o
[ 75%] Building C object CMakeFiles/vterm-module.dir/elisp.c.o
[100%] Linking C shared module ../vterm-module.so
[100%] Built target vterm-module
installing
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./cmake_install.cmake
./Makefile
./CMakeCache.txt
./CMakeFiles
./CMakeFiles/Makefile.cmake
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./CMakeFiles/vterm-module.dir
./CMakeFiles/vterm-module.dir/elisp.c.o
./CMakeFiles/vterm-module.dir/utf8.c.o
./CMakeFiles/vterm-module.dir/vterm-module.c.o
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builder for '/nix/store/v7b3lws7r3y941lv4gryfrap3w0rfg8z-emacs-libvterm-unstable-2017-11-24.drv' failed with exit code 1
cannot build derivation '/nix/store/jg6wgzq51mnbfh7qxldpr3bsm4y30mb8-emacs-with-packages-25.3.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/p3fkljz8qbg7da96kplwdsipxwcjijjf-home-manager-path.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/hbww6f9633bv72md22s668hgdwcgpwdb-home-manager-generation.drv': 1 dependencies couldn't be built
error: build of '/nix/store/hbww6f9633bv72md22s668hgdwcgpwdb-home-manager-generation.drv' failed