diff --git a/cmake/config.h.in b/cmake/config.h.in
index dbadd2a..023ac20 100644
--- a/cmake/config.h.in
+++ b/cmake/config.h.in
@@ -152,9 +152,6 @@
 /* Define to 1 if you have the `__sbrk' function. */
 #cmakedefine01 HAVE___SBRK
 
-/* prefix where we look for installed files */
-#cmakedefine INSTALL_PREFIX
-
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 #cmakedefine LT_OBJDIR
 
diff --git a/configure.ac b/configure.ac
index 897bfae..32b4855 100644
--- a/configure.ac
+++ b/configure.ac
@@ -449,9 +449,6 @@ AX_PTHREAD
 # Figure out where libc has program_invocation_name
 AC_PROGRAM_INVOCATION_NAME
 
-# Make the install prefix available, to figure out where to look for pprof
-AC_INSTALL_PREFIX
-
 dnl only very recent mingw has sleep and nanosleep
 case "$host" in
    *-mingw*)
diff --git a/m4/install_prefix.m4 b/m4/install_prefix.m4
deleted file mode 100644
index ef33f42..0000000
--- a/m4/install_prefix.m4
+++ /dev/null
@@ -1,8 +0,0 @@
-AC_DEFUN([AC_INSTALL_PREFIX],
-  [ac_cv_install_prefix="$prefix";
-   if test x"$ac_cv_install_prefix" = x"NONE" ; then
-     ac_cv_install_prefix="$ac_default_prefix";
-   fi
-   AC_DEFINE_UNQUOTED(INSTALL_PREFIX, "$ac_cv_install_prefix",
-     [prefix where we look for installed files])
-   ])
diff --git a/vsprojects/include/config.h b/vsprojects/include/config.h
index 8500677..869c84f 100644
--- a/vsprojects/include/config.h
+++ b/vsprojects/include/config.h
@@ -164,9 +164,6 @@
 /* Define to 1 if you have the `__sbrk' function. */
 /* #undef HAVE___SBRK */
 
-/* prefix where we look for installed files */
-/* #undef INSTALL_PREFIX */
-
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 /* #undef LT_OBJDIR */