diff --git a/ANNOUNCE b/ANNOUNCE
index 68f15a6a9..00be58a44 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.5.0alpha01 - January 2, 2010
+Libpng 1.5.0alpha01 - January 3, 2010
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -55,7 +55,7 @@ version 1.4.1alpha02 [December 11, 2009]
     change in version 1.2.41beta08 caused transparency to be handled wrong
     in some 16-bit datastreams (Yusaku Sugai).
 
-version 1.5.0alpha01 [January 2, 2010]
+version 1.5.0alpha01 [January 3, 2010]
   Bump version to 1.5.0alpha01
   Add "depth" parameter to private png_build_gamma_table()
   Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
@@ -70,6 +70,9 @@ version 1.5.0alpha01 [January 2, 2010]
   Recognize and use "--sysroot=DIR" in libpng-config.in and libpng.pc.in
   Recognize and use environment variable $PKG_CONFIG_SYSROOT_DIR as default
     setting of ${sysroot} in libpng.pc.in
+  Removed the just-added sysroot feature.  It is the job of pkg-config,
+    not foo.pc, to mangle the directory locations when $PKG_CONFIG_SYSROOT_DIR
+    has been defined.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 58a459b99..94205f658 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2437,7 +2437,7 @@ version 1.4.1alpha02 [December 11, 2009]
     change in version 1.2.41beta08 caused transparency to be handled wrong
     in some 16-bit datastreams (Yusaku Sugai).
 
-version 1.5.0alpha01 [January 2, 2010]
+version 1.5.0alpha01 [January 3, 2010]
   Bump version to 1.5.0alpha01
   Add "depth" parameter to private png_build_gamma_table()
   Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
@@ -2453,6 +2453,9 @@ version 1.5.0alpha01 [January 2, 2010]
   Recognize and use "--sysroot=DIR" in libpng-config.in and libpng.pc.in
   Recognize and use environment variable $PKG_CONFIG_SYSROOT_DIR as default
     setting of ${sysroot} in libpng.pc.in
+  Removed the just-added sysroot feature.  It is the job of pkg-config,
+    not foo.pc, to mangle the directory locations when $PKG_CONFIG_SYSROOT_DIR
+    has been defined.
 
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
diff --git a/libpng-config.in b/libpng-config.in
index 50d344206..9874b4c41 100755
--- a/libpng-config.in
+++ b/libpng-config.in
@@ -11,12 +11,11 @@
 
 # Modeled after libxml-config.
 
-sysroot=""
 version="@PNGLIB_VERSION@"
-prefix="${sysroot}@prefix@"
-exec_prefix="${sysroot}@exec_prefix@"
-libdir="${sysroot}@libdir@"
-includedir="${sysroot}@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
+prefix="@prefix@"
+exec_prefix="@exec_prefix@"
+libdir="@libdir@"
+includedir="@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
 libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
 all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ @LIBS@"
 I_opts="-I${includedir}"
diff --git a/libpng.pc.in b/libpng.pc.in
index 4ba1c6263..3e7e2c58a 100644
--- a/libpng.pc.in
+++ b/libpng.pc.in
@@ -1,8 +1,7 @@
-sysroot=${PKG_CONFIG_SYSROOT_DIR}
-prefix=${sysroot}@prefix@
-exec_prefix=${sysroot}@exec_prefix@
-libdir=${sysroot}@libdir@
-includedir=${sysroot}@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
 
 Name: libpng
 Description: Loads and saves PNG files