diff --git a/dev/ci/ci-bedrock2.sh b/dev/ci/ci-bedrock2.sh
index ba88e4cd5e6c6..728bc77529393 100644
--- a/dev/ci/ci-bedrock2.sh
+++ b/dev/ci/ci-bedrock2.sh
@@ -10,7 +10,7 @@ git_download fiat_crypto
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/fiat_crypto/rupicola/bedrock2"
   COQMF_ARGS='-arg "-async-proofs-tac-j 1"' make
   make install
diff --git a/dev/ci/ci-category_theory.sh b/dev/ci/ci-category_theory.sh
index b5ed059402559..9a4d299363db6 100644
--- a/dev/ci/ci-category_theory.sh
+++ b/dev/ci/ci-category_theory.sh
@@ -9,7 +9,7 @@ git_download category_theory
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/category_theory"
   make
   make install
diff --git a/dev/ci/ci-color.sh b/dev/ci/ci-color.sh
index e6ee79d5360e7..00962692406b8 100644
--- a/dev/ci/ci-color.sh
+++ b/dev/ci/ci-color.sh
@@ -9,7 +9,7 @@ git_download color
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/color"
   make
 )
diff --git a/dev/ci/ci-coq_library_undecidability.sh b/dev/ci/ci-coq_library_undecidability.sh
index 3ef55f97b46de..8564a562d64cf 100644
--- a/dev/ci/ci-coq_library_undecidability.sh
+++ b/dev/ci/ci-coq_library_undecidability.sh
@@ -9,7 +9,7 @@ git_download coq_library_undecidability
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/coq_library_undecidability"
   make
   make install
diff --git a/dev/ci/ci-corn.sh b/dev/ci/ci-corn.sh
index 56b33a9ad7a6a..5226271603f35 100644
--- a/dev/ci/ci-corn.sh
+++ b/dev/ci/ci-corn.sh
@@ -9,7 +9,7 @@ git_download corn
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/corn"
   ./configure.sh
   make
diff --git a/dev/ci/ci-engine_bench.sh b/dev/ci/ci-engine_bench.sh
index d0134081b73ab..38eea71dbc4e3 100644
--- a/dev/ci/ci-engine_bench.sh
+++ b/dev/ci/ci-engine_bench.sh
@@ -9,7 +9,7 @@ git_download engine_bench
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler ondemand'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/engine_bench"
   make coq
   make coq-perf-Sanity
diff --git a/dev/ci/ci-equations.sh b/dev/ci/ci-equations.sh
index 2df3462a8e425..e376c721b602b 100644
--- a/dev/ci/ci-equations.sh
+++ b/dev/ci/ci-equations.sh
@@ -9,7 +9,7 @@ git_download equations
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/equations"
   [ -e Makefile.coq ] || ./configure.sh coq
   make
diff --git a/dev/ci/ci-equations_test.sh b/dev/ci/ci-equations_test.sh
index 2e7ae070ca1c9..0eb51116d541f 100644
--- a/dev/ci/ci-equations_test.sh
+++ b/dev/ci/ci-equations_test.sh
@@ -7,7 +7,7 @@ ci_dir="$(dirname "$0")"
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/equations"
   make test-suite examples
 )
diff --git a/dev/ci/ci-fiat_crypto.sh b/dev/ci/ci-fiat_crypto.sh
index 89b2bde870363..93adc5f78cf5c 100644
--- a/dev/ci/ci-fiat_crypto.sh
+++ b/dev/ci/ci-fiat_crypto.sh
@@ -17,7 +17,7 @@ stacksize=32768
 # version of other developments
 make_args=(EXTERNAL_REWRITER=1 EXTERNAL_COQPRIME=1)
 
-export COQEXTRAFLAGS='-native-compiler no' # following bedrock2
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no" # following bedrock2
 ( cd "${CI_BUILD_DIR}/fiat_crypto"
   ulimit -s $stacksize
   make "${make_args[@]}" pre-standalone-extracted printlite lite ||
diff --git a/dev/ci/ci-fiat_crypto_legacy.sh b/dev/ci/ci-fiat_crypto_legacy.sh
index 443d46e434f57..044b5b081501b 100644
--- a/dev/ci/ci-fiat_crypto_legacy.sh
+++ b/dev/ci/ci-fiat_crypto_legacy.sh
@@ -24,7 +24,7 @@ targets2=(
     selected-specific-display
 )
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/fiat_crypto_legacy"
   make "${targets1[@]}"
   make -j 1 "${targets2[@]}"
diff --git a/dev/ci/ci-jasmin.sh b/dev/ci/ci-jasmin.sh
index 7f7f3f26dbad3..02c1722b517b2 100644
--- a/dev/ci/ci-jasmin.sh
+++ b/dev/ci/ci-jasmin.sh
@@ -9,7 +9,7 @@ git_download jasmin
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 
 ( cd "${CI_BUILD_DIR}/jasmin"
   make -C proofs
diff --git a/dev/ci/ci-lean_importer.sh b/dev/ci/ci-lean_importer.sh
index c16ee489d6dec..0f87c2b47c456 100644
--- a/dev/ci/ci-lean_importer.sh
+++ b/dev/ci/ci-lean_importer.sh
@@ -9,7 +9,7 @@ git_download lean_importer
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 
 ( cd "${CI_BUILD_DIR}/lean_importer"
   make
diff --git a/dev/ci/ci-ltac2_compiler.sh b/dev/ci/ci-ltac2_compiler.sh
index 49bc10d2939ec..9e6c70e6f6e3d 100644
--- a/dev/ci/ci-ltac2_compiler.sh
+++ b/dev/ci/ci-ltac2_compiler.sh
@@ -9,7 +9,7 @@ git_download ltac2_compiler
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 
 ( cd "${CI_BUILD_DIR}/ltac2_compiler"
   make .merlin
diff --git a/dev/ci/ci-metacoq.sh b/dev/ci/ci-metacoq.sh
index 6a4d958061d07..87cccb7f40ff0 100644
--- a/dev/ci/ci-metacoq.sh
+++ b/dev/ci/ci-metacoq.sh
@@ -9,7 +9,7 @@ git_download metacoq
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/metacoq"
   [ -e pcuic/metacoq-config ] || ./configure.sh local
   make all TIMED=pretty-timed
diff --git a/dev/ci/ci-unimath.sh b/dev/ci/ci-unimath.sh
index ccd27b08b9f14..384ed12c6518f 100644
--- a/dev/ci/ci-unimath.sh
+++ b/dev/ci/ci-unimath.sh
@@ -9,7 +9,7 @@ git_download unimath
 
 if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/unimath"
   # these files consumes too much memory for the shared workers
   # (at least with -j 2 when the scheduler runs them in parallel)
diff --git a/dev/ci/ci-vst.sh b/dev/ci/ci-vst.sh
index 14afef3d84558..eae339234b101 100644
--- a/dev/ci/ci-vst.sh
+++ b/dev/ci/ci-vst.sh
@@ -15,7 +15,7 @@ if [ "$DOWNLOAD_ONLY" ]; then exit 0; fi
 # export COMPCERT=bundled
 
 # See ci-compcert.sh
-export COQEXTRAFLAGS='-native-compiler no'
+COQEXTRAFLAGS="$COQEXTRAFLAGS -native-compiler no"
 ( cd "${CI_BUILD_DIR}/vst"
   make IGNORECOQVERSION=true IGNORECOMPCERTVERSION=true
 )
diff --git a/dev/ci/ci-wrapper.sh b/dev/ci/ci-wrapper.sh
index 654475338d66b..4eb84a78e14ff 100755
--- a/dev/ci/ci-wrapper.sh
+++ b/dev/ci/ci-wrapper.sh
@@ -14,6 +14,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd "${DIR}/../.." || exit 1
 
 export TIMED=1
+export COQEXTRAFLAGS='-color yes'
 bash "${DIR}/${CI_SCRIPT}" 2>&1 | tee time-of-build.log
 code=$?
 echo 'Aggregating timing log...'