diff --git a/lib/graphic/gmt.h b/lib/graphic/gmt.h
index acbb4bd..70053f2 100644
--- a/lib/graphic/gmt.h
+++ b/lib/graphic/gmt.h
@@ -34,7 +34,6 @@
 #include <ctime>
 
 #include "gmt/gmt.h"
-#include "../core/array.h"
 #include "../io/file_io.h"
 #include "../io/netcdf_io.h"
 
diff --git a/lib/math/fft.h b/lib/math/fft.h
index 12467b7..5ae4587 100644
--- a/lib/math/fft.h
+++ b/lib/math/fft.h
@@ -28,15 +28,12 @@
 #ifndef _GCTL_FFT_H
 #define _GCTL_FFT_H
 
-// get library configuration 
-#include "../gctl_config.h"
+#include "../core/matrix.h"
 
 #ifdef GCTL_FFTW3
 #include "fftw3.h"
 #endif // GCTL_FFTW3
 
-#include "../core/matrix.h"
-
 namespace gctl
 {
     /**
diff --git a/lib/math/geometry2d.h b/lib/math/geometry2d.h
index 59e316a..6aab19f 100644
--- a/lib/math/geometry2d.h
+++ b/lib/math/geometry2d.h
@@ -28,6 +28,7 @@
 #ifndef _GCTL_GEOMETRY2D_H
 #define _GCTL_GEOMETRY2D_H
 
+#include "../poly/triangle2d.h"
 #include "../poly/edge2d.h"
 
 namespace gctl