diff --git a/lgtm.yml b/lgtm.yml
index 2c94567ce8..1e71806bb6 100644
--- a/lgtm.yml
+++ b/lgtm.yml
@@ -9,7 +9,6 @@ extraction:
         - texinfo
         - flex
         - bison
-        - g++
         - gawk
         - build-essential
         - unzip
@@ -30,7 +29,7 @@ extraction:
       - cd $LGTM_WORKSPACE/buildtools/buildtools-master/jam && make && BINDIR=$LGTM_WORKSPACE/bin ./jam0 install
     configure:
       command:
-        - ./configure --cross-tools-source $LGTM_WORKSPACE/buildtools/buildtools-master --build-cross-tools x86_64 --use-gcc-pipe -j2
+        - acx_cv_prog_cc_warning__Werror_format_diag=no ./configure --cross-tools-source $LGTM_WORKSPACE/buildtools/buildtools-master --build-cross-tools x86_64 --use-gcc-pipe -j2
     index:
       build_command:
         - HAIKU_REVISION=hrev90000 $LGTM_WORKSPACE/bin/jam -j2 @nightly-raw