diff --git a/apps/Make1 b/apps/Make1
index 43a2266..a29b29f 100644
--- a/apps/Make1
+++ b/apps/Make1
@@ -23,7 +23,7 @@ TARGET = gnucap-default-plugins
 #------------------------------------------------------------------------
 INSTALL_FILES = $(TARGET)$(TARGET_EXT)
 #------------------------------------------------------------------------
-INSTALL_DIR = $(PREFIX)/lib/gnucap
+INSTALL_DIR = $(PREFIX)/lib64/gnucap
 #------------------------------------------------------------------------
 DELETED =
 #------------------------------------------------------------------------
diff --git a/lib/Make1 b/lib/Make1
index 27f839f..bd9fbfb 100644
--- a/lib/Make1
+++ b/lib/Make1
@@ -23,7 +23,7 @@ TARGET = libgnucap
 #------------------------------------------------------------------------
 INSTALL_FILES = $(TARGET)$(TARGET_EXT)
 #------------------------------------------------------------------------
-INSTALL_DIR = $(PREFIX)/lib
+INSTALL_DIR = $(PREFIX)/lib64
 #------------------------------------------------------------------------
 DELETED =
 #------------------------------------------------------------------------
diff --git a/main/Make1 b/main/Make1
index 14d44c7..2d92c1f 100644
--- a/main/Make1
+++ b/main/Make1
@@ -24,7 +24,7 @@ TARGET = gnucap
 INSTALL_DIR = $(PREFIX)/bin
 INSTALL_FILES = $(TARGET)$(TARGET_EXT) ../gnucap-conf
 #------------------------------------------------------------------------
-INSTALL_SYSCONF_DIR = $(PREFIX)/etc
+INSTALL_SYSCONF_DIR = $(PREFIX)/../etc
 INSTALL_SYSCONF_FILES = ../gnucap.conf
 #------------------------------------------------------------------------
 DELETED =
diff --git a/main/configure b/main/configure
index b68d06a..47e43a2 100755
--- a/main/configure
+++ b/main/configure
@@ -23,8 +23,8 @@ fi
 
 sed -e "s#/usr/local#$prefix#" ../Makefile.template > Makefile
 #----------------------------------------------------------------
-pkglibdir='${prefix}/lib/gnucap'
-pkglibdir_expanded="${prefix}/lib/gnucap"
+pkglibdir='${prefix}/lib64/gnucap'
+pkglibdir_expanded="${prefix}/lib64/gnucap"
 
 # bug. this is not implemented consistently.
 CXX=${CXX-c++}
@@ -32,11 +32,11 @@ CXX=${CXX-c++}
 fill_template() {
 sed -e "s#@prefix@#$prefix#" \
     -e "s#@exec_prefix@#$prefix#" \
-    -e "s#@libdir@#$prefix/lib#" \
+    -e "s#@libdir@#$prefix/lib64#" \
     -e "s#@includedir@#$\{prefix\}/include#" \
     -e "s#@datarootdir@#$\{prefix\}/share/gnucap#" \
     -e "s#@docdir@#$\{prefix\}/share/doc/gnucap#" \
-    -e "s#@sysconfdir@#$\{prefix\}/etc#" \
+    -e "s#@sysconfdir@#$\{prefix\}/../etc#" \
     -e "s#@pkglibdir@#$pkglibdir#" \
     -e "s#@pkglibdir_expanded@#$pkglibdir_expanded#" \
     -e "s#@CXXFLAGS@#$CCFLAGS#" \