I am trying to build firefox version 68.0 from source using the following options: ``` #Set up the config options export MOZCONFIG=`pwd`/mozconfig cat > mozconfig << EOF mk_add_options MOZ_MAKE_FLAGS="-j4" # If you have installed dbus-glib, comment out this line: # ac_add_options --disable-dbus # If you have installed dbus-glib, and you have installed (or will install) # wireless-tools, and you wish to use geolocation web services, comment out # this line ac_add_options --disable-necko-wifi # API Keys for geolocation APIs - necko-wifi (above) is required for MLS # Uncomment the following line if you wish to use Mozilla Location Service #ac_add_options --with-mozilla-api-keyfile=$PWD/mozilla-key # Uncomment the following line if you wish to use Google's geolocaton API # (needed for use with saved maps with Google Maps) #ac_add_options --with-google-api-keyfile=$PWD/google-key # Uncomment this line if you have installed startup-notification: #ac_add_options --enable-startup-notification # Uncomment the following option if you have not installed PulseAudio ac_add_options --disable-pulseaudio # and uncomment this if you installed alsa-lib instead of PulseAudio ac_add_options --enable-alsa # If you have installed GConf, comment out this line ac_add_options --disable-gconf # The BLFS editors recommend not changing anything below this line: ac_add_options --prefix=/scratch/local/firefox-68.0 ac_add_options --enable-application=browser ac_add_options --disable-crashreporter ac_add_options --disable-updater # enabling the tests will use a lot more space and significantly # increase the build time, for no obvious benefit. ac_add_options --disable-tests # Optimization for size is broken with gcc7 and later ac_add_options --enable-optimize="-O2" ac_add_options --enable-official-branding # From firefox-61 system cairo is not supported ac_add_options --enable-system-ffi ac_add_options --enable-system-pixman # From firefox-62 --with-pthreads is not recognized ac_add_options --with-system-bz2 #ac_add_options --with-system-jpeg #ac_add_options --with-system-png ac_add_options --with-system-zlib mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/firefox-build-dir EOF ``` ./mach build failed with the errors: ``` 11:29.42 /home/linuxbrew/.linuxbrew/bin/clang++ -o Unified_cpp_js_src_jit7.o -c -I/scratch/Downloads/firefox-68.0/firefox-build-dir/dist/system_wrappers -include /scratch/Downloads/firefox-68.0/config/gcc_hidden.h -DNDEBUG=1 -DTRIMMED=1 -DWASM_HUGE_MEMORY -DJS_HAS_CTYPES -DEXPORT_JS_API -DMOZ_HAS_MOZGLUE -I/scratch/Downloads/firefox-68.0/js/src/jit -I/scratch/Downloads/firefox-68.0/firefox-build-dir/js/src/jit -I/scratch/Downloads/firefox-68.0/firefox-build-dir/js/src -I/scratch/Downloads/firefox-68.0/js/src -I/scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include -I/scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/nspr -fPIC -DMOZILLA_CLIENT -include /scratch/Downloads/firefox-68.0/firefox-build-dir/js/src/js-confdefs.h -Qunused-arguments -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-strong -Qunused-arguments -Wall -Wbitfield-enum-conversion -Wempty-body -Wignored-qualifiers -Woverloaded-virtual -Wpointer-arith -Wshadow-field-in-constructor-modified -Wsign-compare -Wtype-limits -Wunreachable-code -Wunreachable-code-return -Wwrite-strings -Wno-invalid-offsetof -Wclass-varargs -Wfloat-overflow-conversion -Wfloat-zero-conversion -Wloop-analysis -Wc++1z-compat -Wc++2a-compat -Wcomma -Wimplicit-fallthrough -Wstring-conversion -Wtautological-overlap-compare -Wtautological-unsigned-enum-zero-compare -Wtautological-unsigned-zero-compare -Wno-inline-new-delete -Wno-error=deprecated-declarations -Wno-error=array-bounds -Wno-error=backend-plugin -Wno-error=return-std-move -Wno-error=atomic-alignment -Wformat -Wformat-security -Wno-gnu-zero-variadic-macro-arguments -Wno-noexcept-type -Wno-unknown-warning-option -Wno-return-type-c-linkage -fno-sized-deallocation -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fno-rtti -ffunction-sections -fdata-sections -fno-exceptions -fno-math-errno -pthread -pipe -g -O2 -fomit-frame-pointer -funwind-tables -fno-strict-aliasing -Werror=format -Wno-shadow -MD -MP -MF .deps/Unified_cpp_js_src_jit7.o.pp /scratch/Downloads/firefox-68.0/firefox-build-dir/js/src/jit/Unified_cpp_js_src_jit7.cpp 11:30.32 [style 0.0.1] cargo:rerun-if-changed=build_gecko.rs 11:30.32 [style 0.0.1] cargo:rerun-if-changed=/scratch/Downloads/firefox-68.0/firefox-build-dir/layout/style/bindgen.toml 11:30.32 [style 0.0.1] cargo:rerun-if-changed=/scratch/Downloads/firefox-68.0/layout/style/ServoBindings.toml 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:127:1: warning: replacement function 'operator new' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:130:5: error: exception specification in declaration does not match previous declaration 11:32.51 [style 0.0.1] /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/new:91:7: note: previous declaration is here 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:134:21: warning: replacement function 'operator new' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:139:21: warning: replacement function 'operator new[]' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:139:56: error: exception specification in declaration does not match previous declaration 11:32.51 [style 0.0.1] /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/new:92:7: note: previous declaration is here 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:144:21: warning: replacement function 'operator new[]' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:149:21: warning: replacement function 'operator delete' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:154:21: warning: replacement function 'operator delete' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:159:21: warning: replacement function 'operator delete[]' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/mozalloc.h:164:21: warning: replacement function 'operator delete[]' cannot be declared 'inline' [-Winline-new-delete] 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:49:22: error: no member named 'is_trivial' in namespace 'std' 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:49:33: error: 'From' does not refer to a value 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:42:33: note: declared here 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:49:40: error: no member named 'value' in the global namespace 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:52:22: error: no member named 'is_trivial' in namespace 'std' 11:32.51 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:52:33: error: 'To' does not refer to a value 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:42:20: note: declared here 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Casting.h:52:38: error: no member named 'value' in the global namespace 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Span.h:416:36: error: no type named 'nullptr_t' in namespace 'std' 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Span.h:64:25: error: no matching function for call to 'forward' 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/Span.h:663:21: note: in instantiation of function template specialization 'mozilla::narrow_cast<unsigned long, unsigned long>' requested here 11:32.52 [style 0.0.1] /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/move.h:51:5: note: candidate function template not viable: no known conversion from 'unsigned long' to 'typename std::identity<unsigned long>::type &&' (aka 'unsigned long &&') for 1st argument 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/DbgMacro.h:30:48: error: no member named 'declval' in namespace 'std' 11:32.52 [style 0.0.1] /scratch/Downloads/firefox-68.0/firefox-build-dir/dist/include/mozilla/DbgMacro.h:30:68: error: expected '(' for function-style cast or type construction ... ``` I have all the dependecies installed in /home/linuxbrew/.linux and the build setting works previously with firefox 64.0. It seems the build system is looking for dependency in /usr/lib, which contains ancient version of compiler toolchain that can't build firefox. How do I tell the build system to exclude looking into /usr/lib at all?