fix comment

configure

@@ -107,11 +107,7 @@ else
     PKG_CFLAGS="$PKG_CFLAGS -DIS_BIG_ENDIAN"
 fi
 
-# Check for pre-specified R_S2_ABSL_HOME, which could be used in development
-# to avoid recompiling Abseil when recompiling a clean version of the package.
-# We might be able to use a previously installed Abseil, but as of this
-# writing it is difficult to guarantee that it will work with an arbitrary
-# Abseil installation.
+# Check pkg-config for abseil-cpp, but fall back to a cmake build
 if pkg-config absl_base --libs 2>/dev/null; then
   echo "** Using abseil-cpp from pkg-config"
   export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}:`pwd`/tools/pkgconfig"