diff --git a/install.sh b/install.sh
index 05ffd9b..45fbc8d 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,15 @@
 #!/bin/bash
 
 git submodule update --init --recursive
-pip2 install --user pyflakes
-pip3 install --user pynvim
-sudo npm install -g tern
+
+if [ -x "$(command -v pip2)" ]; then
+    pip2 install --user pyflakes
+fi
+
+if [ -x "$(command -v pip3)" ]; then
+    pip3 install --user pynvim
+fi
+
+if [ -x "$(command -v npm)" ]; then
+    sudo npm install -g tern
+fi