diff --git a/tool/CMakeLists.txt b/tool/CMakeLists.txt
index 3febaac..02abc43 100644
--- a/tool/CMakeLists.txt
+++ b/tool/CMakeLists.txt
@@ -41,6 +41,17 @@ target_link_libraries(aaruformattool
         ICU::uc
 )
 
+# On Linux, enable GNU/POSIX feature test macros so functions like strerror_r
+# and cfmakeraw are declared by system headers. We limit this to UNIX and not
+# Apple (macOS provides these declarations differently).
+if(UNIX AND NOT APPLE)
+    target_compile_definitions(aaruformattool PRIVATE
+                               _GNU_SOURCE
+                               _DEFAULT_SOURCE
+                               _XOPEN_SOURCE=700)
+endif()
+
+
 # On macOS/iOS, explicitly link the C++ standard library for ICU dependencies
 if(APPLE)
     target_link_libraries(aaruformattool PRIVATE "-lc++")
diff --git a/tool/info.c b/tool/info.c
index 80ee256..b14bc73 100644
--- a/tool/info.c
+++ b/tool/info.c
@@ -72,7 +72,7 @@ int info(const char *path)
     aaruformat_context  *ctx          = NULL;
     char                *strBuffer    = NULL;
     UErrorCode           u_error_code = U_ZERO_ERROR;
-    uint                 i            = 0;
+    uint32_t             i            = 0;
     mediaTagEntry const *mediaTag     = NULL;
     mediaTagEntry const *tmpMediaTag  = NULL;
 
@@ -548,7 +548,7 @@ int info(const char *path)
                 free(strBuffer);
             }
 
-            for(uint j = 0; j < ctx->dump_hardware_entries_with_data[i].entry.extents; j++)
+            for(uint32_t j = 0; j < ctx->dump_hardware_entries_with_data[i].entry.extents; j++)
             {
                 printf("\t\tExtent %d:\n", j);
                 printf("\t\t\tStart: %llu\n", ctx->dump_hardware_entries_with_data[i].extents[j].start);