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error: redefinition of ap_hack_apr_allocator_create

error: redefinition of ap_hack_apr_allocator_create

Geek Flare Blog post is sponsored by Netsparker Web Application Security Scanner.

Apache Web Server source code compilation is always fun.

It’s very rare that Apache will be compiled on the first run on a brand new server.

The fact is it requires a lot of pre-requisite and if any of them is missing or version compatibility then you may have to spend a lot of time on fixing those.

I was working on the brand new server Linux 6.4 to install Apache 2.4.6 and encountered following error.

exports.c:1929:
error: redefinition of 'ap_hack_apr_allocator_create'
exports.c:921: note: previous definition of 'ap_hack_apr_allocator_create' was here exports.c:1930:
error: redefinition of 'ap_hack_apr_allocator_destroy'
exports.c:922: note: previous definition of 'ap_hack_apr_allocator_destroy' was here exports.c:1931:
error: redefinition of 'ap_hack_apr_allocator_alloc' exports.c:923: note: previous definition of 'ap_hack_apr_allocator_alloc' was here exports.c:1932:
error: redefinition of 'ap_hack_apr_allocator_free' exports.c:924: note: previous definition of 'ap_hack_apr_allocator_free' was here exports.c:1933:
error: redefinition of 'ap_hack_apr_allocator_owner_set'
exports.c:925: note: previous definition of 'ap_hack_apr_allocator_owner_set' was here exports.c:1934:
error: redefinition of 'ap_hack_apr_allocator_owner_get' exports.c:926: note: previous definition of 'ap_hack_apr_allocator_owner_get' was here exports.c:1935:
error: redefinition of 'ap_hack_apr_allocator_max_free_set' exports.c:927: note: previous definition of 'ap_hack_apr_allocator_max_free_set' was here exports.c:1937:
error: redefinition of 'ap_hack_apr_allocator_mutex_set' exports.c:929: note: previous definition of 'ap_hack_apr_allocator_mutex_set' was here exports.c:1938:
error: redefinition of 'ap_hack_apr_allocator_mutex_get' exports.c:930: note: previous definition of 'ap_hack_apr_allocator_mutex_get' was here exports.c:1944:
error: redefinition of 'ap_hack_apr_atomic_init' exports.c:936: note: previous definition of 'ap_hack_apr_atomic_init' was here exports.c:1945:
error: redefinition of 'ap_hack_apr_atomic_read32' exports.c:937: note: previous definition of 'ap_hack_apr_atomic_read32' was here exports.c:1946:
error: redefinition of 'ap_hack_apr_atomic_set32' exports.c:938: note: previous definition of 'ap_hack_apr_atomic_set32' was here exports.c:1947:
error: redefinition of 'ap_hack_apr_atomic_add32' exports.c:939: note: previous definition of 'ap_hack_apr_atomic_add32' was here exports.c:1948:
error: redefinition of 'ap_hack_apr_atomic_sub32' exports.c:940: note: previous definition of 'ap_hack_apr_atomic_sub32' was here exports.c:1949:
error: redefinition of 'ap_hack_apr_atomic_inc32' exports.c:941: note: previous definition of 'ap_hack_apr_atomic_inc32' was here exports.c:1950:
error: redefinition of 'ap_hack_apr_atomic_dec32' exports.c:942: note: previous definition of 'ap_hack_apr_atomic_dec32' was here exports.c:1951:
error: redefinition of 'ap_hack_apr_atomic_cas32' exports.c:943: note: previous definition of 'ap_hack_apr_atomic_cas32' was here exports.c:1952:
error: redefinition of 'ap_hack_apr_atomic_xchg32' exports.c:944: note: previous definition of 'ap_hack_apr_atomic_xchg32' was here exports.c:1953:
error: redefinition of 'ap_hack_apr_atomic_casptr' exports.c:945: note: previous definition of 'ap_hack_apr_atomic_casptr' was here exports.c:1954:
error: redefinition of 'ap_hack_apr_atomic_xchgptr' exports.c:946: note: previous definition of 'ap_hack_apr_atomic_xchgptr' was here exports.c:1960:
error: redefinition of 'ap_hack_apr_dso_load' exports.c:1085: note: previous definition of 'ap_hack_apr_dso_load' was here exports.c:1961:
error: redefinition of 'ap_hack_apr_dso_unload' exports.c:1086: note: previous definition of 'ap_hack_apr_dso_unload' was here exports.c:1962:
error: redefinition of 'ap_hack_apr_dso_sym' exports.c:1087: note: previous definition of 'ap_hack_apr_dso_sym' was here exports.c:1963:
error: redefinition of 'ap_hack_apr_dso_error' exports.c:1088: note: previous definition of 'ap_hack_apr_dso_error' was here exports.c:1969:
error: redefinition of 'ap_hack_apr_env_get' exports.c:1094: note: previous definition of 'ap_hack_apr_env_get' was here exports.c:1970:
error: redefinition of 'ap_hack_apr_env_set' exports.c:1095: note: previous definition of 'ap_hack_apr_env_set' was here exports.c:1971:
error: redefinition of 'ap_hack_apr_env_delete' exports.c:1096: note: previous definition of 'ap_hack_apr_env_delete' was here exports.c:1976:
error: redefinition of 'ap_hack_apr_strerror' exports.c:1101: note: previous definition of 'ap_hack_apr_strerror' was here export.c:1981:
error: redefinition of 'ap_hack_apr_stat' exports.c:1106: note: previous definition of 'ap_hack_apr_stat' was here exports.c:1982:
error: redefinition of 'ap_hack_apr_dir_open' exports.c:1107: note: previous definition of 'ap_hack_apr_dir_open' was here exports.c:1983:
error: redefinition of 'ap_hack_apr_dir_close' exports.c:1108: note: previous definition of 'ap_hack_apr_dir_close' was here

If you are getting a similar error, you can fix it as I did by following.

Solution

After looking into various parameters, I noticed this happens when you have apr-util lower version than 1.4.1

  • Verify your apr-util version. If you find lower version, then you must install the 1.4.1 or higher
  • Download apr-util source code from http://mirror.nus.edu.sg/apache/apr/
  • Extract the downloaded file

Compile and install as following

./configure 
make 
make install

By default, it will install under /usr/local/apr/bin/apu-1-config

Now you can compline apache with newly installed apr-util and it should be okay.

./configure --with-apr-util=/usr/local/apr/bin/apu-1-config

Did it help?

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Chandan Kumar
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Chandan Kumar is the founder of Geek Flare. Learn more here and connect with him on Twitter.

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