diff -ur motion-4.1.1.orig/configure.ac motion-4.1.1/configure.ac
--- motion-4.1.1.orig/configure.ac	2018-10-15 06:35:24.000000000 +0000
+++ motion-4.1.1/configure.ac	2018-10-15 06:42:05.044046190 +0000
@@ -617,13 +617,13 @@
     if test $exec_prefix = "NONE"; then
         BIN_PATH="$BIN_PATH/bin"
     else
-        BIN_PATH="$BIN_PATH/$bindir"
+        BIN_PATH="$bindir"
     fi
 else
     if test $exec_prefix = "NONE";then
         BIN_PATH="$prefix/bin"
     else
-        BIN_PATH="$prefix/$bindir"
+        BIN_PATH="$bindir"
     fi
 fi
 AC_SUBST(BIN_PATH)