--- ./tests/core/dirent.c.ORIG	2020-06-04 10:46:58 +0200
+++ ./tests/core/dirent.c	2020-11-03 17:51:08 +0100
@@ -209,12 +209,14 @@
 	check_counts(&odd);
 }
 
+/* AIX FILENAME_MAX is 255 which does not return error at open() */
+#define Linux_FILENAME_MAX 4096
 /* test filename length limits */
 void test_core_dirent__length_limits(void)
 {
-	char *big_filename = (char *)git__malloc(FILENAME_MAX + 1);
-	memset(big_filename, 'a', FILENAME_MAX + 1);
-	big_filename[FILENAME_MAX] = 0;
+	char *big_filename = (char *)git__malloc(Linux_FILENAME_MAX + 1);
+	memset(big_filename, 'a', Linux_FILENAME_MAX + 1);
+	big_filename[Linux_FILENAME_MAX] = 0;
 
 	cl_must_fail(p_creat(big_filename, 0666));
 
--- ./tests/config/conditionals.c.ORIG	2020-06-04 10:46:58 +0200
+++ ./tests/config/conditionals.c	2020-11-23 12:23:49 +0100
@@ -50,7 +50,14 @@
 
 static char *sandbox_path(git_buf *buf, const char *suffix)
 {
+#ifdef _AIX61
+	/* char PN[PATH_MAX];  leads to error no memeory later on */
+	char *PN;
+	PN = malloc(PATH_MAX * 10);
+	char *path = p_realpath(clar_sandbox_path(), PN);
+#else
 	char *path = p_realpath(clar_sandbox_path(), NULL);
+#endif
 	cl_assert(path);
 	cl_git_pass(git_buf_attach(buf, path, 0));
 	cl_git_pass(git_buf_joinpath(buf, buf->ptr, suffix));
--- ./tests/repo/discover.c.ORIG	2020-06-04 10:46:58 +0200
+++ ./tests/repo/discover.c	2020-11-23 17:30:52 +0100
@@ -30,7 +30,14 @@
 {
 	git_buf found_path = GIT_BUF_INIT, resolved = GIT_BUF_INIT;
 
+#ifdef _AIX61
+	char *PN;
+	PN = malloc(PATH_MAX * 10);
+	git_buf_attach(&resolved, p_realpath(expected_path, PN), 0);
+#else
 	git_buf_attach(&resolved, p_realpath(expected_path, NULL), 0);
+#endif
+
 	cl_assert(resolved.size > 0);
 	cl_git_pass(git_path_to_dir(&resolved));
 	cl_git_pass(git_repository_discover(&found_path, start_path, 1, ceiling_dirs));