diff --git a/doctest.h b/doctest.h
index 5c754cd..ffbd34a 100644
--- a/doctest.h
+++ b/doctest.h
@@ -7082,7 +7082,7 @@ namespace detail {
 
 #ifdef DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 DOCTEST_MSVC_SUPPRESS_WARNING_WITH_PUSH(4007) // 'function' : must be 'attribute' - see issue #182
-int main(int argc, char** argv) { return doctest::Context(argc, argv).run(); }
+
 DOCTEST_MSVC_SUPPRESS_WARNING_POP
 #endif // DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 
diff --git a/histogram.cpp b/histogram.cpp
index a54fe18..2d35027 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -1,5 +1,6 @@
 #include "histogram.h"
 #include <vector>
+#include "histogram_internal.h"
 void find_minmax(const std::vector <double> &numbers, double &min, double &max, bool &res)
 {
     if (numbers.size()==0)
diff --git a/main.cpp b/main.cpp
index d4e7d58..8b6cb7c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -31,9 +31,10 @@ int
 main()
 {
     bool res = false;
-    auto in = input_data();
+    Input in = input_data();
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
+    return 0;
 }
 
 
diff --git a/svg.cpp b/svg.cpp
index dbee47e..3669a33 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -1,5 +1,4 @@
 #include <iostream>
-#include <vector>
 #include "svg.h"
 
 void