diff --git a/mex_compute_press_flux.m b/mex_compute_press_flux.m
index 47dec613..e83ddf16 100644
--- a/mex_compute_press_flux.m
+++ b/mex_compute_press_flux.m
@@ -67,9 +67,16 @@ function varargout = mex_compute_press_flux(varargin)
 % $Date$
 % $Revision$
 
-   buildmex -O -largeArrayDims -DCOMPILING_FOR_MATLAB=1 ...
-            mex_compute_press_flux.c hybsys.c           ...
-            -lmwlapack -lmwblas
+   buildmex CFLAGS="\$CFLAGS -Wall -Wextra -ansi -pedantic           ...
+        -Wformat-nonliteral -Wcast-align -Wpointer-arith             ...
+        -Wbad-function-cast -Wmissing-prototypes -Wstrict-prototypes ...
+        -Wmissing-declarations -Winline -Wundef -Wnested-externs     ...
+        -Wcast-qual -Wshadow -Wconversion -Wwrite-strings            ...
+        -Wno-conversion -Wchar-subscripts -Wredundant-decls"         ...
+   ...
+        -O -largeArrayDims -DCOMPILING_FOR_MATLAB=1 ...
+        mex_compute_press_flux.c hybsys.c           ...
+        -lmwlapack -lmwblas
 
    % Call MEX'ed edition.
    [varargout{1:nargout}] = mex_compute_press_flux(varargin{:});
diff --git a/mex_ip_simple.m b/mex_ip_simple.m
index b33e0579..12d01aed 100644
--- a/mex_ip_simple.m
+++ b/mex_ip_simple.m
@@ -65,9 +65,16 @@ function varargout = mex_ip_simple(varargin)
 % $Date$
 % $Revision$
 
-   buildmex -O -largeArrayDims -DCOMPILING_FOR_MATLAB=1 ...
-            mex_ip_simple.c mimetic.c mrst_api.c        ...
-            -lmwlapack -lmwblas
+   buildmex CFLAGS="\$CFLAGS -Wall -Wextra -ansi -pedantic           ...
+        -Wformat-nonliteral -Wcast-align -Wpointer-arith             ...
+        -Wbad-function-cast -Wmissing-prototypes -Wstrict-prototypes ...
+        -Wmissing-declarations -Winline -Wundef -Wnested-externs     ...
+        -Wcast-qual -Wshadow -Wconversion -Wwrite-strings            ...
+        -Wno-conversion -Wchar-subscripts -Wredundant-decls"         ...
+   ...
+        -O -largeArrayDims -DCOMPILING_FOR_MATLAB=1 ...
+        mex_ip_simple.c mimetic.c mrst_api.c        ...
+        -lmwlapack -lmwblas
 
    % Call MEX'ed edition.
    [varargout{1:nargout}] = mex_ip_simple(varargin{:});