diff --git a/config.m4 b/config.m4
index bec484d..aa1f259 100644
--- a/config.m4
+++ b/config.m4
@@ -1,94 +1,92 @@
 dnl config.m4 for the solr extension
 
 PHP_ARG_ENABLE([solr],
-  [whether to enable the Solr extension],
-  [AS_HELP_STRING([--enable-solr],
-    [Enable solr support])])
+	[whether to enable the Solr extension],
+	[AS_HELP_STRING([--enable-solr], [Enable solr support])])
 
 PHP_ARG_ENABLE([solr-debug],
-  [whether to compile with solr in verbose mode],
-  [AS_HELP_STRING([--enable-solr-debug],
-    [Compile with solr in verbose mode])],
-  [no],
-  [no])
+	[whether to compile with solr in verbose mode],
+	[AS_HELP_STRING([--enable-solr-debug],
+	[Compile with solr in verbose mode])],
+	[no],
+	[no])
 
 PHP_ARG_ENABLE([coverage],
-  [whether to enable code coverage],
-  [AS_HELP_STRING([--enable-coverage],
-    [Enable developer code coverage information])],,
-  [no])
+	[whether to enable code coverage],
+	[AS_HELP_STRING([--enable-coverage],
+	[Enable developer code coverage information])],,
+	[no])
 
 dnl Setting up the apache Solr extension
 if test "$PHP_SOLR" != "no"; then
 
 	PKG_CHECK_MODULES([CURL], [libcurl >= 7.15.5])
-	PHP_CHECK_LIBRARY(curl,curl_easy_perform,
-    [
-        AC_DEFINE(HAVE_CURL,1,[ ])
-    ],[
-        AC_MSG_ERROR(There is something wrong. Please check config.log for more information.)
-    ],[
-        $CURL_LIBS
-    ])
+	PHP_CHECK_LIBRARY(curl, curl_easy_perform,
+	[
+		AC_DEFINE(HAVE_CURL, 1, [ ])
+	],[
+		AC_MSG_ERROR(There is something wrong. Please check config.log for more information.)
+	],[
+		$CURL_LIBS
+	])
 
-    PHP_EVAL_INCLINE($CURL_CFLAGS)
-    PHP_EVAL_LIBLINE($CURL_LIBS, SOLR_SHARED_LIBADD)
+	PHP_EVAL_INCLINE($CURL_CFLAGS)
+	PHP_EVAL_LIBLINE($CURL_LIBS, SOLR_SHARED_LIBADD)
 
 	if test "$PHP_LIBXML" = "no"; then
-        AC_MSG_ERROR([Solr extension requires LIBXML extension, add --enable-libxml])
+		AC_MSG_ERROR([Solr extension requires LIBXML extension, add --enable-libxml])
 	fi
 
 	AC_MSG_CHECKING(for JSON)
-    if test -f "$phpincludedir/ext/json/php_json.h" || test "$HAVE_JSON" != "no"; then
-        AC_DEFINE(HAVE_JSON, 1, [JSON support])
-        AC_MSG_RESULT(Yes)
-    else
-        AC_MSG_ERROR([Solr extension requires json or jsonc support])
-    fi
+	if test -f "$phpincludedir/ext/json/php_json.h" || test "$HAVE_JSON" != "no"; then
+		AC_DEFINE(HAVE_JSON, 1, [JSON support])
+		AC_MSG_RESULT(Yes)
+	else
+		AC_MSG_ERROR([Solr extension requires json or jsonc support])
+	fi
 
 	PHP_SETUP_LIBXML(SOLR_SHARED_LIBADD)
 
-    AC_DEFINE(HAVE_SOLR, 1,[Setting the value of HAVE_SOLR to 1 ])
+	AC_DEFINE(HAVE_SOLR, 1, [Setting the value of HAVE_SOLR to 1 ])
 
-    if test "$PHP_SOLR_DEBUG" != "no"; then
-       AC_DEFINE(SOLR_DEBUG, 1,     [Setting the value of SOLR_DEBUG to 1 ])
-    else
-       AC_DEFINE(SOLR_DEBUG_OFF, 1, [Setting the value of SOLR_DEBUG_OFF to 1 ])
-    fi
+	if test "$PHP_SOLR_DEBUG" != "no"; then
+		AC_DEFINE(SOLR_DEBUG, 1,     [Setting the value of SOLR_DEBUG to 1 ])
+	else
+		AC_DEFINE(SOLR_DEBUG_OFF, 1, [Setting the value of SOLR_DEBUG_OFF to 1 ])
+	fi
 
-    if test "$PHP_COVERAGE" = "yes"; then
-        AX_CHECK_COMPILE_FLAG([-fprofile-arcs], [COVERAGE_CFLAGS="$COVERAGE_CFLAGS -fprofile-arcs"])
-        AX_CHECK_COMPILE_FLAG([-ftest-coverage], [COVERAGE_CFLAGS="$COVERAGE_CFLAGS -ftest-coverage"])
-        EXTRA_LDFLAGS="$COVERAGE_CFLAGS"
-    fi
+	if test "$PHP_COVERAGE" = "yes"; then
+		AX_CHECK_COMPILE_FLAG([-fprofile-arcs], [COVERAGE_CFLAGS="$COVERAGE_CFLAGS -fprofile-arcs"])
+		AX_CHECK_COMPILE_FLAG([-ftest-coverage], [COVERAGE_CFLAGS="$COVERAGE_CFLAGS -ftest-coverage"])
+		EXTRA_LDFLAGS="$COVERAGE_CFLAGS"
+	fi
 
-    export OLD_CPPFLAGS="$CPPFLAGS"
-    export CPPFLAGS="$CPPFLAGS $INCLUDES"
+	export OLD_CPPFLAGS="$CPPFLAGS"
+	export CPPFLAGS="$CPPFLAGS $INCLUDES"
 
-    subdir=src
-    PHP_SOLR_SRC_FILES="$subdir/php_solr.c \
-                             $subdir/php_solr_object.c \
-                             $subdir/php_solr_document.c \
-                             $subdir/php_solr_input_document.c \
-                             $subdir/php_solr_client.c \
-                             $subdir/php_solr_params.c \
-                             $subdir/php_solr_query.c \
-                             $subdir/php_solr_response.c \
-                             $subdir/php_solr_exception.c \
-                             $subdir/php_solr_utils.c \
-                             $subdir/php_solr_dismax_query.c \
-                             $subdir/php_solr_collapse_function.c \
-                             $subdir/php_solr_extract.c \
-                             $subdir/solr_string.c \
-                             $subdir/solr_functions_document.c \
-                             $subdir/solr_functions_client.c \
-                             $subdir/solr_functions_helpers.c \
-                             $subdir/solr_functions_params.c \
-                             $subdir/solr_functions_response.c \
-                             $subdir/solr_functions_debug.c"
+	subdir=src
+	PHP_SOLR_SRC_FILES="$subdir/php_solr.c \
+		$subdir/php_solr_object.c \
+		$subdir/php_solr_document.c \
+		$subdir/php_solr_input_document.c \
+		$subdir/php_solr_client.c \
+		$subdir/php_solr_params.c \
+		$subdir/php_solr_query.c \
+		$subdir/php_solr_response.c \
+		$subdir/php_solr_exception.c \
+		$subdir/php_solr_utils.c \
+		$subdir/php_solr_dismax_query.c \
+		$subdir/php_solr_collapse_function.c \
+		$subdir/php_solr_extract.c \
+		$subdir/solr_string.c \
+		$subdir/solr_functions_document.c \
+		$subdir/solr_functions_client.c \
+		$subdir/solr_functions_helpers.c \
+		$subdir/solr_functions_params.c \
+		$subdir/solr_functions_response.c \
+		$subdir/solr_functions_debug.c"
 
-    PHP_NEW_EXTENSION(solr, $PHP_SOLR_SRC_FILES,
-    						 $ext_shared,, [$COVERAGE_CFLAGS])
-    PHP_ADD_BUILD_DIR($abs_builddir/$subdir, 1)
-    PHP_SUBST(SOLR_SHARED_LIBADD)
+	PHP_NEW_EXTENSION(solr, $PHP_SOLR_SRC_FILES, $ext_shared,, [$COVERAGE_CFLAGS])
+	PHP_ADD_BUILD_DIR($abs_builddir/$subdir, 1)
+	PHP_SUBST(SOLR_SHARED_LIBADD)
 fi