diff --git a/gebs.h b/gebs.h
index d88620b..cd856a3 100644
--- a/gebs.h
+++ b/gebs.h
@@ -73,19 +73,8 @@ int main(int argc, char ** argv)
 #ifndef GEBS_H_
 #define GEBS_H_
 
-
-// ----------------------------------------------------------------------------
-// Platform macros
-// ----------------------------------------------------------------------------
-
-#define GEBS_PLATFORM_POSIX 0
-
-#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
-#   define GEBS_PLATFORM GEBS_PLATFORM_POSIX
-#endif
-
-#ifndef GEBS_PLATFORM
-#   error "GEBS_PLATFORM is undefined!"
+#if !(defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)))
+#   error "gebs works only on posix platforms"
 #endif
 
 // ----------------------------------------------------------------------------
@@ -100,15 +89,11 @@ int main(int argc, char ** argv)
 #include <stdarg.h>
 #include <string.h>
 
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
-#   include <unistd.h>
-#   include <sys/stat.h>
-#   include <sys/types.h>
-#   include <sys/wait.h>
-#   include <sys/mman.h>
-#else
-#   error "Unknown GEBS_PLATFORM"
-#endif
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
 
 #define discard __attribute__((unused))
 
@@ -402,7 +387,6 @@ int gebs_cmd_run_sync_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd)
     gebs_sb_finish_alloc(alloc, &sb);
     GEBS_LOGI("cmd `%s`\n", sb.items);
 
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
     // Clone the list
     Gebs_Cmd new_cmd = {0};
     defer { gebs_cmd_free_alloc(alloc, &new_cmd); }
@@ -438,9 +422,6 @@ int gebs_cmd_run_sync_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd)
             } while(!WIFEXITED(wstatus) && !WIFSIGNALED(wstatus));
         } 
     }
-#else
-#   error "gebs_cmd_run_sync_alloc unknown command"
-#endif
 }
 
 int gebs_cmd_run_sync_collect_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd, Gebs_String_Builder *sb_out)
@@ -450,7 +431,6 @@ int gebs_cmd_run_sync_collect_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd, Gebs_S
     gebs_sb_finish_alloc(alloc, &sb);
     GEBS_LOGI("cmd `%s`\n", sb.items);
 
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
     // Clone the list
     Gebs_Cmd new_cmd = {0};
     defer { gebs_cmd_free_alloc(alloc, &new_cmd); }
@@ -502,9 +482,6 @@ int gebs_cmd_run_sync_collect_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd, Gebs_S
             } while(!WIFEXITED(wstatus) && !WIFSIGNALED(wstatus));
         } 
     }
-#else
-#   error "gebs_cmd_run_sync_alloc unknown command"
-#endif
 }
 
 // ----------------------------------------------------------------------------
@@ -667,41 +644,26 @@ void gebs_scratch_arena_reset(void)
 
 bool gebs_mkdir(const char *p)
 {
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
+    GEBS_LOGO("mkdir %s\n", p);
     return mkdir(p, 0777) == 0;
-#else
-#   error "gebs_mkdir unknown platform"
-#endif
 }
 
 bool gebs_exists(const char *p)
 {
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
     struct stat st;
     return stat(p, &st) == 0;
-#else
-#   error "gebs_exists unknown platform"
-#endif
 }
 
 bool gebs_rename(const char *a, const char *b)
 {
     GEBS_LOGO("rename %s -> %s\n", a, b);
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
     return rename(a, b) == 0;
-#else
-#   error "gebs_rename unknown platform"
-#endif
 }
 
 bool gebs_remove(const char *p)
 {
     GEBS_LOGO("remove %s\n", p);
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
     return remove(p) == 0;
-#else
-#   error "gebs_remove unknown platform"
-#endif
 }
 
 // ----------------------------------------------------------------------------
@@ -710,7 +672,6 @@ bool gebs_remove(const char *p)
 
 bool gebs_needs_rebuild(const char *out, const char *in)
 {
-#if GEBS_PLATFORM == GEBS_PLATFORM_POSIX
     time_t out_mtime = 0;
     time_t in_mtime = 0;
 
@@ -720,9 +681,6 @@ bool gebs_needs_rebuild(const char *out, const char *in)
     if (stat(in, &attr2) == 0) { in_mtime = attr2.st_mtime; }
 
     return in_mtime > out_mtime;
-#else
-#   error "gebs_needs_rebuild unknown platform"
-#endif
 }
 
 void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,