NanoNote's OpenWRT fork only has glib2 v2.26.1
This turns out to be sufficient
--- a/configure.ac
+++ b/configure.ac
@@ -77,7 +77,7 @@ AC_SUBST(DOXYGEN_HAVE_DOT)
 AC_CHECK_PROG(SCITECO, sciteco, sciteco)
 
 # Checks for libraries.
-PKG_CHECK_MODULES(LIBGLIB, [glib-2.0 >= 2.28], [
+PKG_CHECK_MODULES(LIBGLIB, [glib-2.0 >= 2.26.1], [
 	CFLAGS="$CFLAGS $LIBGLIB_CFLAGS"
 	CXXFLAGS="$CXXFLAGS $LIBGLIB_CFLAGS"
 	LIBS="$LIBS $LIBGLIB_LIBS"
--- a/src/sciteco.h	2015-09-22 04:44:52.941205805 +0200
+++ b/src/sciteco.h	2015-09-22 04:52:31.705192570 +0200
@@ -24,6 +24,11 @@
 
 #include "interface.h"
 
+#if !GLIB_CHECK_VERSION(2,28,0)
+#define g_slist_free_full(LIST,FUNC) \
+        g_slist_foreach(LIST, (GFunc)FUNC, NULL)
+#endif
+
 namespace SciTECO {
 
 #if TECO_INTEGER == 32
--- a/src/spawn.cpp	2015-09-22 04:56:34.069185578 +0200
+++ b/src/spawn.cpp	2015-09-22 04:58:58.089181423 +0200
@@ -73,6 +73,13 @@
 
 #endif
 
+#ifndef G_SOURCE_CONTINUE
+#define G_SOURCE_CONTINUE TRUE
+#endif
+#ifndef G_SOURCE_REMOVE
+#define G_SOURCE_REMOVE FALSE
+#endif
+
 namespace SciTECO {
 
 namespace States {