diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8092f18d0..23098d201 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -118,3 +118,20 @@ build:ubuntu-trusty:
     - ./configure -C
     - make -j$(nproc)
     - make install
+
+build:alpine:
+  image: alpine
+  before_script:
+    - >
+       apk add --no-progress -q
+       autoconf automake curl-dev dbus-dev g++ gdk-pixbuf-dev git gmp-dev
+       glew-dev glib-dev gmime-dev gsl-dev gst-plugins-base-dev gstreamer-dev gtk+2.0-dev gtk+3.0-dev
+       gtkglext-dev imlib2-dev gettext-dev libffi-dev mesa-dev libgnome-keyring-dev mariadb-dev librsvg-dev
+       libsm-dev libxcursor-dev libxml2-dev libxslt-dev libxtst-dev make ncurses-dev pcre-dev pkgconf
+       poppler-dev postgresql-dev qt5-qtsvg-dev qt5-qtwebkit-dev qt5-qtx11extras-dev sdl2-dev sdl2_image-dev
+       sdl2_mixer-dev sdl2_ttf-dev sdl_mixer-dev sqlite-dev unixodbc-dev xdg-utils zlib-dev
+  script:
+    - ./reconf-all
+    - GAMBAS_CONFIG_FAILURE=1 ./configure -C --disable-openal --disable-qt4 --disable-sdl --disable-sqlite2 --disable-v4l
+    - make -j$(nproc)
+    - make install
diff --git a/acinclude.m4 b/acinclude.m4
index 48fd8bdbc..e397ec649 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -558,6 +558,11 @@ AC_DEFUN([GB_SYSTEM],
       AC_DEFINE(OS_LINUX, 1, [Target system is Linux])
       AC_DEFINE(SYSTEM, "Linux", [Operating system])
       ;;
+    *-*-linux* )
+      SYSTEM=LINUX
+      AC_DEFINE(OS_LINUX, 1, [Target system is Linux])
+      AC_DEFINE(SYSTEM, "Linux", [Operating system])
+      ;;
     *-*-freebsd* )
       SYSTEM=FREEBSD
       AC_DEFINE(OS_BSD, 1, [Target system is of BSD family])
diff --git a/gb.crypt/configure.ac b/gb.crypt/configure.ac
index 7191d00e1..4c88b6383 100644
--- a/gb.crypt/configure.ac
+++ b/gb.crypt/configure.ac
@@ -10,7 +10,7 @@ AC_PROG_LIBTOOL
 GB_COMPONENT(
   crypt, CRYPT, gb.crypt, [src],
   [],
-  [GB_FIND(libcrypt.$SHLIBEXT, $prefix /usr/local /usr, lib)],
+  [],
   [-lcrypt])
  
 AC_OUTPUT( \