diff --git a/examples/CMDTEST_gcc.rb b/examples/CMDTEST_gcc.rb
index 9467e43..dc18ba1 100644
--- a/examples/CMDTEST_gcc.rb
+++ b/examples/CMDTEST_gcc.rb
@@ -25,10 +25,14 @@
 
 class CMDTEST_gcc < Cmdtest::Testcase
 
+  def gcc
+    ENV["CMDTEST_GCC_TO_TEST"] || "gcc"
+  end
+
   #----------------------------------------
 
   def test_no_arguments
-    cmd "gcc" do
+    cmd "#{gcc}" do
       stderr_equal [
         /^.*gcc.*: no input files/,
       ]
@@ -39,7 +43,7 @@ class CMDTEST_gcc < Cmdtest::Testcase
   #----------------------------------------
 
   def test_nonexisting_input
-    cmd "gcc -c non-existing.c" do
+    cmd "#{gcc} -c non-existing.c" do
       stderr_equal [
         /^.*gcc.*: non-existing.c: No such file/,
         /^.*gcc.*: no input files/,
@@ -47,7 +51,7 @@ class CMDTEST_gcc < Cmdtest::Testcase
       exit_nonzero
     end
 
-    cmd "gcc non-existing.c" do
+    cmd "#{gcc} non-existing.c" do
       stderr_equal [
         /^.*gcc.*: non-existing.c: No such file/,
         /^.*gcc.*: no input files/,
@@ -55,7 +59,7 @@ class CMDTEST_gcc < Cmdtest::Testcase
       exit_nonzero
     end
 
-    cmd "gcc non-existing.o" do
+    cmd "#{gcc} non-existing.o" do
       stderr_equal [
         /^.*gcc.*: non-existing.o: No such file/,
         /^.*gcc.*: no input files/,
@@ -70,32 +74,32 @@ class CMDTEST_gcc < Cmdtest::Testcase
 
     create_file "alpha.c", "int add_alpha(int x, int y) { return x+y; }"
 
-    cmd "gcc -c alpha.c" do
+    cmd "#{gcc} -c alpha.c" do
       created_files "alpha.o"
     end
 
     create_file "beta.c", "int add_beta(int x, int y) { return x+y; }"
     create_file "gamma.c", "int add_gamma(int x, int y) { return x+y; }"
 
-    cmd "gcc -c beta.c gamma.c" do
+    cmd "#{gcc} -c beta.c gamma.c" do
       created_files "beta.o", "gamma.o"
     end
 
-    cmd "gcc alpha.c -c" do
+    cmd "#{gcc} alpha.c -c" do
       written_files "alpha.o"
     end
 
-    cmd "gcc beta.c -c gamma.c" do
+    cmd "#{gcc} beta.c -c gamma.c" do
       written_files "beta.o", "gamma.o"
     end
 
-    cmd "gcc -c alpha.o" do
+    cmd "#{gcc} -c alpha.o" do
       stderr_equal [
         /^.*gcc.*: alpha.o: linker input file unused because linking not done/,
       ]
     end
 
-    cmd "gcc -c alpha.o beta.o" do
+    cmd "#{gcc} -c alpha.o beta.o" do
       stderr_equal [
         /^.*gcc.*: alpha.o: linker input file unused because linking not done/,
         /^.*gcc.*: beta.o: linker input file unused because linking not done/,
@@ -109,15 +113,15 @@ class CMDTEST_gcc < Cmdtest::Testcase
 
     create_file "alpha.c", "int add_alpha(int x, int y) { return x+y; }"
 
-    cmd "gcc -c alpha.c -o alpha.o" do
+    cmd "#{gcc} -c alpha.c -o alpha.o" do
       created_files "alpha.o"
     end
 
-    cmd "gcc -c alpha.c -o beta.o" do
+    cmd "#{gcc} -c alpha.c -o beta.o" do
       created_files "beta.o"
     end
 
-    cmd "gcc -o gamma.o -c alpha.c" do
+    cmd "#{gcc} -o gamma.o -c alpha.c" do
       created_files "gamma.o"
     end
   end
@@ -128,19 +132,19 @@ class CMDTEST_gcc < Cmdtest::Testcase
 
     create_file "alpha.c", "int main() { return 17; }"
 
-    cmd "gcc -c alpha.c" do
+    cmd "#{gcc} -c alpha.c" do
       created_files "alpha.o"
     end
 
-    cmd "gcc alpha.o" do
+    cmd "#{gcc} alpha.o" do
       created_files "a.out"
     end
 
-    cmd "gcc alpha.o -o beta" do
+    cmd "#{gcc} alpha.o -o beta" do
       created_files "beta"
     end
 
-    cmd "gcc -o gamma alpha.o" do
+    cmd "#{gcc} -o gamma alpha.o" do
       created_files "gamma"
     end
 
@@ -153,19 +157,19 @@ class CMDTEST_gcc < Cmdtest::Testcase
     create_file "alpha.c", "extern int beta ; int main() { return beta; }"
     create_file "beta.c", "int beta = 17;"
 
-    cmd "gcc -c alpha.c beta.c" do
+    cmd "#{gcc} -c alpha.c beta.c" do
       created_files "alpha.o", "beta.o"
     end
 
-    cmd "gcc alpha.o beta.o" do
+    cmd "#{gcc} alpha.o beta.o" do
       created_files "a.out"
     end
 
-    cmd "gcc alpha.o beta.o -o beta" do
+    cmd "#{gcc} alpha.o beta.o -o beta" do
       created_files "beta"
     end
 
-    cmd "gcc -o gamma alpha.o beta.o" do
+    cmd "#{gcc} -o gamma alpha.o beta.o" do
       created_files "gamma"
     end
 
@@ -178,23 +182,23 @@ class CMDTEST_gcc < Cmdtest::Testcase
     create_file "alpha.c", "extern int beta ; int main() { return beta; }"
     create_file "beta.c", "int beta = 17;"
 
-    cmd "gcc alpha.c beta.c" do
+    cmd "#{gcc} alpha.c beta.c" do
       created_files "a.out"
     end
 
-    cmd "gcc alpha.c beta.c -o gamma" do
+    cmd "#{gcc} alpha.c beta.c -o gamma" do
       created_files "gamma"
     end
 
-    cmd "gcc -o delta alpha.c beta.c" do
+    cmd "#{gcc} -o delta alpha.c beta.c" do
       created_files "delta"
     end
 
-    cmd "gcc -c alpha.c" do
+    cmd "#{gcc} -c alpha.c" do
       created_files "alpha.o"
     end
 
-    cmd "gcc -o epsilon alpha.o beta.c" do
+    cmd "#{gcc} -o epsilon alpha.o beta.c" do
       created_files "epsilon"
     end
 
@@ -209,12 +213,12 @@ class CMDTEST_gcc < Cmdtest::Testcase
       "int variable = VALUE;",
     ]
 
-    cmd "gcc -E alpha.c" do
+    cmd "#{gcc} -E alpha.c" do
       stdout_equal /"alpha.c"/
       stdout_equal /^int variable = 17;/
     end
 
-    cmd "gcc -E alpha.c -o alpha.preprocessed" do
+    cmd "#{gcc} -E alpha.c -o alpha.preprocessed" do
       created_files "alpha.preprocessed"
       file_equal "alpha.preprocessed", /"alpha.c"/
       file_equal "alpha.preprocessed", /^int variable = 17;/
@@ -235,15 +239,15 @@ class CMDTEST_gcc < Cmdtest::Testcase
       "AAA --- BBB",
     ]
 
-    cmd "gcc -E alpha.c" do
+    cmd "#{gcc} -E alpha.c" do
       stdout_equal /^aaa_in_file --- bbb_in_file/
     end
 
-    cmd "gcc -DAAA=aaa_option -E alpha.c" do
+    cmd "#{gcc} -DAAA=aaa_option -E alpha.c" do
       stdout_equal /^aaa_option --- bbb_in_file/
     end
 
-    cmd "gcc -DAAA=aaa_option -DBBB=bbb_option -E alpha.c" do
+    cmd "#{gcc} -DAAA=aaa_option -DBBB=bbb_option -E alpha.c" do
       stdout_equal /^aaa_option --- bbb_option/
     end
 
@@ -260,19 +264,19 @@ class CMDTEST_gcc < Cmdtest::Testcase
     create_file "dir1/alpha.h", "this_is_dir1"
     create_file "dir2/alpha.h", "this_is_dir2"
 
-    cmd "gcc -Idir1 -E alpha.c" do
+    cmd "#{gcc} -Idir1 -E alpha.c" do
       stdout_equal /this_is_dir1/
     end
 
-    cmd "gcc -Idir2 -E alpha.c" do
+    cmd "#{gcc} -Idir2 -E alpha.c" do
       stdout_equal /this_is_dir2/
     end
 
-    cmd "gcc -Idir1 -Idir2 -E alpha.c" do
+    cmd "#{gcc} -Idir1 -Idir2 -E alpha.c" do
       stdout_equal /this_is_dir1/
     end
 
-    cmd "gcc -Idir2 -Idir1 -E alpha.c" do
+    cmd "#{gcc} -Idir2 -Idir1 -E alpha.c" do
       stdout_equal /this_is_dir2/
     end
 
@@ -288,13 +292,13 @@ class CMDTEST_gcc < Cmdtest::Testcase
     create_file "dir2/beta2.h", "dir2_beta2_h"
     create_file "dir2/beta12.h", "dir2_beta12_h"
 
-    cmd "gcc -Idir1 -Idir2 -E beta.c" do
+    cmd "#{gcc} -Idir1 -Idir2 -E beta.c" do
       stdout_equal /dir1_beta1_h/
       stdout_equal /dir1_beta12_h/
       stdout_equal /dir2_beta2_h/
     end
 
-    cmd "gcc -Idir2 -Idir1 -E beta.c" do
+    cmd "#{gcc} -Idir2 -Idir1 -E beta.c" do
       stdout_equal /dir1_beta1_h/
       stdout_equal /dir2_beta12_h/
       stdout_equal /dir2_beta2_h/