Description:

gcc -include "../src/config.h" -I"../src" -I"../lib/csparse" -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/libxml2 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I"../lib/lua" -I/usr/include/libpng16 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -Wl,-O1,--sort-common,--as-needed,-z,relro -o naev ai.o array.o background.o base64.o board.o camera.o claim.o collision.o colour.o comm.o cond.o conf.o console.o damagetype.o debris.o dev.o dev_outfit.o dev_planet.o dev_ship.o dev_system.o dev_sysedit.o dev_uniedit.o dialogue.o economy.o equipment.o escort.o event.o explosion.o faction.o fleet.o font.o gui.o gui_omsg.o gui_osd.o hook.o info.o input.o intro.o joystick.o land.o land_outfits.o land_shipyard.o load.o log.o map.o map_find.o map_overlay.o md5.o menu.o mission.o music.o music_openal.o music_sdlmix.o naev.o ndata.o nebula.o news.o nfile.o nlua.o nlua_bkg.o nlua_camera.o nlua_cli.o nlua_col.o nlua_commodity.o nlua_diff.o nlua_evt.o nlua_faction.o nlua_gfx.o nlua_gui.o nlua_hook.o nlua_jump.o nlua_misn.o nlua_music.o nlua_naev.o nlua_outfit.o nlua_pilot.o nlua_planet.o nlua_player.o nlua_rnd.o nlua_ship.o nlua_space.o nlua_system.o nlua_tex.o nlua_time.o nlua_tk.o nlua_tut.o nlua_var.o nlua_vec2.o nmath.o nondata.o npng.o npc.o nstring.o ntime.o nxml.o nxml_lua.o opengl.o opengl_ext.o opengl_matrix.o opengl_render.o opengl_tex.o opengl_vbo.o options.o outfit.o pack.o pause.o perlin.o physics.o pilot.o pilot_cargo.o pilot_ew.o pilot_heat.o pilot_hook.o pilot_outfit.o pilot_weapon.o plasmaf.o player.o player_autonav.o player_gui.o queue.o rng.o save.o ship.o shipstats.o sound.o sound_openal.o sound_sdlmix.o space.o spfx.o start.o tech.o threadpool.o toolkit.o unidiff.o weapon.o ../src/tk/widget/libwidget.a ../lib/csparse/libcsparse.a -L/usr/lib -lSDL -lpthread -lxml2 -lfreetype ../lib/lua/liblua.a -lvorbisfile -lGL -lGLU -lpng16 -lopenal -lSDL_mixer
/usr/bin/ld: dev_sysedit.o: undefined reference to symbol 'fmod@@GLIBC_2.2.5'
/usr/lib/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:758: recipe for target 'naev' failed
make[3]: *** [naev] Error 1
make[3]: Leaving directory '/build/naev/src/naev-0.5.3/src'
Makefile:925: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/build/naev/src/naev-0.5.3/src'
Makefile:660: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/build/naev/src/naev-0.5.3/src'
Makefile:501: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1
==> ERROR: A failure occurred in build().
Aborting...

Steps to reproduce:
sudo extra-x86_64-build