diff --git a/.travis.yml b/.travis.yml
index 34940401f..c5d7c00a1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ install:
 - export SLIC3R_STATIC=1
 - export CXX=g++-7
 - export CC=gcc-7
+- export SLIC3R_VAR_REL=./var
 script:
 - bash package/linux/travis-setup.sh
 - cmake -DBOOST_ROOT=$BOOST_DIR src/
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 86753350d..0a8b9f9b0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,7 +3,20 @@ project (slic3r)
 
 
 # only on newer GCCs: -ftemplate-backtrace-limit=0
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -DM_PI=3.14159265358979323846 -D_GLIBCXX_USE_C99 -DHAS_BOOL -DNOGDI -DBOOST_ASIO_DISABLE_KQUEUE")
+set(CMAKE_CXX_FLAGS "-g ${CMAKE_CXX_FLAGS} -Wall -DM_PI=3.14159265358979323846 -D_GLIBCXX_USE_C99 -DHAS_BOOL -DNOGDI -DBOOST_ASIO_DISABLE_KQUEUE")
+
+if(DEFINED ENV{SLIC3R_VAR_REL})
+    set(CMAKE_CXX_FLAGS "-DVAR_REL=$ENV{SLIC3R_VAR_REL}")
+endif(DEFINED ENV{SLIC3R_VAR_REL})
+
+if(DEFINED ENV{SLIC3R_VAR_ABS})
+    set(CMAKE_CXX_FLAGS "-DVAR_ABS")
+endif(DEFINED ENV{SLIC3R_VAR_ABS})
+
+if(DEFINED ENV{SLIC3R_VAR_ABS_PATH})
+    set(CMAKE_CXX_FLAGS "-DVAR_ABS_PATH=$ENV{SLIC3R_VAR_ABS_PATH}")
+endif(DEFINED ENV{SLIC3R_VAR_ABS_PATH})
+
 
 execute_process(COMMAND git rev-parse --short HEAD OUTPUT_VARIABLE GIT_VERSION ERROR_QUIET)