# Troubleshooting

Below is a list of known issues and fixes (if available).

# Build Error in Function `fork_once_func'

Error Description: WAX Source Code Repository Build Issue

After running sudo ./wax_install.sh to build the WAX Source Code Repository on Ubuntu 18.04, the command line reports an error "In function 'fork_once_func'" (around [90%]):

Scanning dependencies of target test_cypher_suites
Scanning dependencies of target eosio_chain
[ 90%] Building CXX object libraries/fc/test/crypto/CMakeFiles/test_cypher_suites.dir/test_cypher_suites.cpp.o
[ 90%] Building CXX object libraries/chain/CMakeFiles/eosio_chain.dir/merkle.cpp.o
[ 90%] Building CXX object libraries/chain/CMakeFiles/eosio_chain.dir/name.cpp.o
[ 90%] Building CXX object libraries/chain/CMakeFiles/eosio_chain.dir/transaction.cpp.o
[ 90%] Linking CXX executable test_cypher_suites
/usr/lib/x86_64-linux-gnu/libcrypto.a(threads_pthread.o): In function `fork_once_func':
(.text+0x16): undefined reference to `pthread_atfork'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
libraries/fc/test/crypto/CMakeFiles/test_cypher_suites.dir/build.make:113: recipe for target 'libraries/fc/test/crypto/test_cypher_suites' failed
make[2]: *** [libraries/fc/test/crypto/test_cypher_suites] Error 1
CMakeFiles/Makefile2:783: recipe for target 'libraries/fc/test/crypto/CMakeFiles/test_cypher_suites.dir/all' failed
make[1]: *** [libraries/fc/test/crypto/CMakeFiles/test_cypher_suites.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Shortly after receiving this error, the build stops with the following message:

MAKE building EOSIO has exited with the above error. 

# Fix

You can use the steps below to fix the issue and resume the WAX Source Code Repository build process.

  1. From the command line, change your directory to:
cd patches/fc
  1. From the patches/fc directory, run:
  1. When the patch completes, change your directory to:
cd ../../build
  1. From the build directory, run:
make -j $(nproc)

You should now be able to continue the build process.