diff --git a/configure.ac b/configure.ac
index c818343a5ad..aa78c7a16dc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2059,8 +2059,8 @@ if test "${with_ns}" != no; then
        GNUSTEP_LOCAL_HEADERS="-I${GNUSTEP_LOCAL_HEADERS}"
      test "x${GNUSTEP_LOCAL_LIBRARIES}" != "x" && \
        GNUSTEP_LOCAL_LIBRARIES="-L${GNUSTEP_LOCAL_LIBRARIES}"
-     CPPFLAGS="$CPPFLAGS -I${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
-     CFLAGS="$CFLAGS -I${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
+     CPPFLAGS="$CPPFLAGS -isystem ${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
+     CFLAGS="$CFLAGS -isystem ${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
      LDFLAGS="$LDFLAGS -L${GNUSTEP_SYSTEM_LIBRARIES} ${GNUSTEP_LOCAL_LIBRARIES}"
      LIBS_GNUSTEP="-lgnustep-gui -lgnustep-base -lobjc -lpthread"
      dnl GNUstep defines BASE_NATIVE_OBJC_EXCEPTIONS to 0 or 1.
diff --git a/test/infra/gitlab-ci.yml b/test/infra/gitlab-ci.yml
index 41778321773..de1148460aa 100644
--- a/test/infra/gitlab-ci.yml
+++ b/test/infra/gitlab-ci.yml
@@ -229,24 +229,22 @@ test-filenotify-gio:
     # This is needed in order to get a JUnit test report.
     make_params: '-k -C test check-expensive LOGFILES="lisp/autorevert-tests.log lisp/filenotify-tests.log"'
 
-# The next two jobs are commented out due to bug#62210.
+build-image-gnustep:
+  stage: platform-images
+  extends: [.job-template, .build-template, .gnustep-template]
+  variables:
+    target: emacs-gnustep
 
-# build-image-gnustep:
-#   stage: platform-images
-#   extends: [.job-template, .build-template, .gnustep-template]
-#   variables:
-#     target: emacs-gnustep
-
-# test-gnustep:
-#   # This tests the GNUstep build process.
-#   stage: platforms
-#   extends: [.job-template, .gnustep-template]
-#   needs:
-#     - job: build-image-gnustep
-#       optional: true
-#   variables:
-#     target: emacs-gnustep
-#     make_params: install
+test-gnustep:
+  # This tests the GNUstep build process.
+  stage: platforms
+  extends: [.job-template, .gnustep-template]
+  needs:
+    - job: build-image-gnustep
+      optional: true
+  variables:
+    target: emacs-gnustep
+    make_params: install
 
 # The next two jobs are commented out due to high workload on
 # emba.gnu.org.