diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f474ff6f1205929f45c2442bdfb2d1f879a3e90d..6d4a909a3eb04bea0beb94c2d44d174afcb62f4e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,11 @@
+image: ubuntu:rolling
+
+cache:
+  paths:
+    - .cache/pip
+    - venv/
+
 build:
-  image: ubuntu:rolling
   before_script:
     - DEBIAN_FRONTEND=noninteractive apt-get -qq update
     - DEBIAN_FRONTEND=noninteractive apt-get -qq install wget patch make gcc gfortran flex bison texlive
@@ -9,7 +15,8 @@ build:
     - automake -a -c
     - ./configure
     - make
-    - make dist-gzip
+    - make dist
+    - make distcheck
   artifacts:
     paths:
       - boxmox_latest.tar.gz
diff --git a/Makefile.am b/Makefile.am
index 22e6522a5ae7079077b935c9facd1d505b17d86e..75cc3b611a85a8cef2e45b8b69c2d74aa71d4de0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -30,6 +30,7 @@
 #######################################################################################
 
 SUBDIRS = src doc
+EXTRA_DIST = src/bison.h	src/code.h	src/gdata.h	src/gdef.h	src/scan.h
 dist_doc_DATA = README.md doc/kpp_UserManual.pdf doc/boxmox_README.pdf
 dist_bin_SCRIPTS = scripts/list_BOXMOX_mechanisms \
 				   scripts/new_BOXMOX_experiment \
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 3a9d0e84ffb37db217c47cd28876ec847ca4eccc..d8b8043f9f2c805501e21fb2e6bb836b36668d03 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -5,4 +5,7 @@ boxmox_README.pdf : boxmox_README.tex
 	@pdflatex@ $<
 	rm -f *.log *.out *.toc *.aux
 
+clean-local:
+	rm -f boxmox_README.pdf
+
 dist_doc_DATA = boxmox_README.tex boxmox_README.pdf
\ No newline at end of file