--- configure.ac~	2019-04-09 11:27:08.847450956 +0300

+++ configure.ac	2019-04-09 11:30:26.229210127 +0300

@@ -441,9 +441,9 @@

             PKG_CHECK_MODULES(PYGOBJECT, pygobject-3.0 >= $PYGOBJECT_REQUIRED, [

                 found_python3=yes

                 PYTHON3_BIN="$PYTHON"

-                PYTHON3_CFLAGS=`${PYTHON3_CONFIG} --includes`

-                PYTHON3_LIBS=`${PYTHON3_CONFIG} --libs`

-                PYTHON3_LDFLAGS=`${PYTHON3_CONFIG} --ldflags`

+                PYTHON3_CFLAGS=$(${PYTHON3_CONFIG} --includes)

+                PYTHON3_LIBS=$(${PYTHON3_CONFIG} --libs)

+                PYTHON3_LDFLAGS=$(${PYTHON3_CONFIG} --ldflags)

                 AC_SUBST(PYTHON3_BIN)

                 AC_SUBST(PYTHON3_CFLAGS)

                 AC_SUBST(PYTHON3_LIBS)

--- acinclude.m4~	2019-02-27 19:28:20.000000000 +0300

+++ acinclude.m4	2019-04-09 11:47:32.359694333 +0300

@@ -5,8 +5,8 @@

 [AC_REQUIRE([AM_PATH_PYTHON])

 AC_MSG_CHECKING(for headers required to compile python extensions)

 dnl deduce PYTHON_INCLUDES

-py_prefix=`$PYTHON -c "import sys; print sys.prefix"`

-py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`

+py_prefix=$($PYTHON -c "import sys; print sys.prefix")

+py_exec_prefix=$($PYTHON -c "import sys; print sys.exec_prefix")

 PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"

 if test "$py_prefix" != "$py_exec_prefix"; then

   PYTHON_INCLUDES="$PYTHON_INCLUDES -I${py_exec_prefix}/include/python${PYTHON_VERSION}"