diff --git a/eigen.pri b/eigen.pri
index 79f0a5f0..03315ff5 100644
--- a/eigen.pri
+++ b/eigen.pri
@@ -1,18 +1,14 @@
-# Detect eigen3 + eigen2, then use this priority list to determine
-# which eigen to use:
+# Detect eigen3
 #
 # Priority
-# 0. EIGENDIR if set (also EIGEN2DIR for backwards compatability)
+# 0. EIGENDIR if set
 # 1. OPENSCAD_LIBRARIES eigen3
-# 2. OPENSCAD_LIBRARIES eigen2
 # 3. system's standard include paths for eigen3
-# 4. system's standard include paths for eigen2
 
 eigen {
 
 # read environment variables
 OPENSCAD_LIBRARIES_DIR = $$(OPENSCAD_LIBRARIES)
-EIGEN2_DIR = $$(EIGEN2DIR)
 EIGEN_DIR = $$(EIGENDIR)
 
 # Optionally specify location of Eigen3 using the 
@@ -23,20 +19,8 @@ EIGEN_DIR = $$(EIGENDIR)
       EIGEN_INCLUDEPATH = $$OPENSCAD_LIBRARIES_DIR/include/eigen3
     } 
   }
-  isEmpty(EIGEN_INCLUDEPATH) {
-    exists($$OPENSCAD_LIBRARIES_DIR/include/eigen2) {
-      EIGEN_INCLUDEPATH = $$OPENSCAD_LIBRARIES_DIR/include/eigen2
-    } 
-  }
 }
 
-
-# Optionally specify location of Eigen using the 
-# EIGENDIR env. variable (EIGEN2 for backwards compatability)
-!isEmpty(EIGEN2_DIR) { 
-  EIGEN_INCLUDEPATH = $$EIGEN2_DIR
-  message("User set EIGEN location: $$EIGEN_INCLUDEPATH")
-}
 !isEmpty(EIGEN_DIR) { 
   EIGEN_INCLUDEPATH = $$EIGEN_DIR
   message("User set EIGEN location: $$EIGEN_INCLUDEPATH")
@@ -47,17 +31,6 @@ isEmpty(EIGEN_INCLUDEPATH) {
   freebsd-g++: EIGEN_INCLUDEPATH = /usr/local/include/eigen3
   netbsd*: EIGEN_INCLUDEPATH = /usr/pkg/include/eigen3
   macx: EIGEN_INCLUDEPATH = /opt/local/include/eigen3
-  !exists($$EIGEN_INCLUDEPATH) {
-    linux*|hurd*|unix*: EIGEN_INCLUDEPATH = /usr/include/eigen2
-    freebsd-g++: EIGEN_INCLUDEPATH = /usr/local/include/eigen2
-    netbsd*: EIGEN_INCLUDEPATH = /usr/pkg/include/eigen2
-    macx: EIGEN_INCLUDEPATH = /opt/local/include/eigen2
-  }
-}
-
-!exists($$EIGEN_INCLUDEPATH/Eigen/Core) {
-  EIGEN_CFLAGS = $$system("pkg-config --cflags eigen2")
-  EIGEN_INCLUDEPATH = $$replace(EIGEN_CFLAGS,"-I","")
 }
 
 !exists($$EIGEN_INCLUDEPATH/Eigen/Core) {
@@ -72,7 +45,7 @@ isEmpty(EIGEN_INCLUDEPATH) {
   }
 }
 
-# EIGEN being under 'include/eigen[2-3]' needs special prepending
+# EIGEN being under 'include/eigen3' needs special prepending
 contains(QT_VERSION, ^5\\..*) {
   QMAKE_INCDIR = $$EIGEN_INCLUDEPATH $$QMAKE_INCDIR
 } else {