diff --git a/buildScripts/buildFontforge b/buildScripts/buildFontforge
index 4d4e953..139d466 100755
--- a/buildScripts/buildFontforge
+++ b/buildScripts/buildFontforge
@@ -16,4 +16,4 @@ do
   patch -p 1 < $APATCHFILE
 done
 
-make -j `nproc`
+make $MAKE_PARALLEL
diff --git a/buildScripts/buildPdf2htmlEX b/buildScripts/buildPdf2htmlEX
index ad47a2d..efbc54d 100755
--- a/buildScripts/buildPdf2htmlEX
+++ b/buildScripts/buildPdf2htmlEX
@@ -5,5 +5,5 @@
 cd pdf2htmlEX
 mkdir build
 cd build
-cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr ..
-make -j `nproc`
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
+make $MAKE_PARALLEL
diff --git a/buildScripts/buildPdf2htmlEXClang b/buildScripts/buildPdf2htmlEXClang
index 95a4574..6d0b7ee 100755
--- a/buildScripts/buildPdf2htmlEXClang
+++ b/buildScripts/buildPdf2htmlEXClang
@@ -5,5 +5,5 @@
 cd pdf2htmlEX
 mkdir build
 cd build
-CC=clang CXX=clang++ cmake ..
-make
+CC=clang CXX=clang++ cmake -DCMAKE_INSTALL_PREFIX=/usr/local ..
+make $MAKE_PARALLEL
diff --git a/buildScripts/buildPoppler b/buildScripts/buildPoppler
index 458697b..711fbd3 100755
--- a/buildScripts/buildPoppler
+++ b/buildScripts/buildPoppler
@@ -7,4 +7,4 @@ mkdir build
 cd build
 cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local \
     -DENABLE_LIBOPENJPEG=none ..
-make -j `nproc`
+make $MAKE_PARALLEL
diff --git a/buildScripts/travisEnvs b/buildScripts/travisEnvs
new file mode 100644
index 0000000..9ab6776
--- /dev/null
+++ b/buildScripts/travisEnvs
@@ -0,0 +1,3 @@
+
+export MAKE_PARALLEL=-j `nproc`
+
diff --git a/buildScripts/versionEnvs b/buildScripts/versionEnvs
index 3cea7c5..51208ac 100644
--- a/buildScripts/versionEnvs
+++ b/buildScripts/versionEnvs
@@ -5,9 +5,13 @@
 
 #export POPPLER_VERSION=poppler-0.82.0
 export POPPLER_VERSION=poppler-0.81.0
+
 #export FONTFORGE_VERSION=20190801
 export FONTFORGE_VERSION=20170731
+
 export PDF2HTMLEX_VERSION=newBuildSystem
+
 export MACHINE_ARCH=`uname -m`
+
 export DOCKER_FROM=ubuntu:16.04