diff --git a/Makefile b/Makefile
index 4ceed4e..add5d08 100644
--- a/Makefile
+++ b/Makefile
@@ -10,6 +10,13 @@ endif
 
 all: _all
 
+BUILD_DEPS :=
+ifeq ($(MAKECMDGOALS),clean)
+else ifeq ($(MAKECMDGOALS),format)
+else
+    BUILD_DEPS := yes
+endif
+
 VASQ_DIR := .
 include make.mk
 
diff --git a/README.rst b/README.rst
index f991a4a..4b36a84 100644
--- a/README.rst
+++ b/README.rst
@@ -3,8 +3,8 @@ Vanilla Squad
 =============
 
 :Author: Daniel Walker
-:Version: 6.0.3
-:Date: 2022-08-16
+:Version: 6.0.4
+:Date: 2022-08-21
 
 Overview
 ========
diff --git a/changelog b/changelog
index fb03b52..b0d24f5 100644
--- a/changelog
+++ b/changelog
@@ -1,3 +1,8 @@
+6.0.4:
+    - Added the format __attribute__ to several printf-like functions.
+    - Added the BUILD_DEPS variable to make.mk.
+    - deps.mk is now written to VASQ_OBJ_DIR.
+
 6.0.3.:
     - Deprecated various logging wrapper functions such as vasqMalloc.
     - Added the use of LDFLAGS and VASQ_OBJ_DIR to make.mk.
diff --git a/include/vasq/definitions.h b/include/vasq/definitions.h
index 1df1670..c8dae5a 100644
--- a/include/vasq/definitions.h
+++ b/include/vasq/definitions.h
@@ -9,7 +9,7 @@
 /**
  * @brief Current version of the library.
  */
-#define VASQ_VERSION "6.0.3"
+#define VASQ_VERSION "6.0.4"
 
 #ifndef NO_OP
 #define NO_OP ((void)0)
diff --git a/include/vasq/logger.h b/include/vasq/logger.h
index 831f52b..def4570 100644
--- a/include/vasq/logger.h
+++ b/include/vasq/logger.h
@@ -189,7 +189,11 @@ vasqSetLoggerUserData(vasqLogger *logger, void *user);
  * @param format A format string (corresponding to vasqSafeSnprintf's syntax) for the the message.
  */
 void
-vasqLogStatement(const vasqLogger *logger, vasqLogLevel_t level, VASQ_CONTEXT_DECL, const char *format, ...);
+vasqLogStatement(const vasqLogger *logger, vasqLogLevel_t level, VASQ_CONTEXT_DECL, const char *format, ...)
+#ifdef __GNUC__
+    __attribute__((format(printf, 6, 7)))
+#endif
+    ;
 
 /**
  * @brief Emit a message at the ALWAYS level.
@@ -273,7 +277,11 @@ vasqVLogStatement(const vasqLogger *logger, vasqLogLevel_t level, VASQ_CONTEXT_D
  * @param format A format string (corresponding to vasqSafeSnprintf's syntax) for the the message.
  */
 void
-vasqRawLog(const vasqLogger *logger, const char *format, ...);
+vasqRawLog(const vasqLogger *logger, const char *format, ...)
+#ifdef __GNUC__
+    __attribute__((format(printf, 2, 3)))
+#endif
+    ;
 
 /**
  * @brief Same as vasqRawLog but takes a va_list insead of variable arguments.
@@ -313,7 +321,12 @@ vasqHexDump(const vasqLogger *logger, VASQ_CONTEXT_DECL, const char *name, const
  *
  * @return The same return value as malloc.
  */
-void *__attribute__((deprecated)) vasqMalloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, size_t size);
+void *
+vasqMalloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, size_t size)
+#ifdef __GNUC__
+    __attribute__((deprecated))
+#endif
+    ;
 
 /**
  * @brief Wrap vasqMalloc by automatically supplying the file name, function name, and line number.
@@ -334,8 +347,12 @@ void *__attribute__((deprecated)) vasqMalloc(const vasqLogger *logger, VASQ_CONT
  *
  * @return The same return value as calloc.
  */
-void *__attribute__((deprecated))
-vasqCalloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, size_t nmemb, size_t size);
+void *
+vasqCalloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, size_t nmemb, size_t size)
+#ifdef __GNUC__
+    __attribute__((deprecated))
+#endif
+    ;
 
 /**
  * @brief Wrap vasqCalloc by automatically supplying the file name, function name, and line number.
@@ -356,8 +373,12 @@ vasqCalloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, size_t nmemb, size_t siz
  *
  * @return The same return value as realloc.
  */
-void *__attribute__((deprecated))
-vasqRealloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, void *ptr, size_t size);
+void *
+vasqRealloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, void *ptr, size_t size)
+#ifdef __GNUC__
+    __attribute__((deprecated))
+#endif
+    ;
 
 /**
  * @brief Wrap vasqRealloc by automatically supplying the file name, function name, and line number.
@@ -377,7 +398,12 @@ vasqRealloc(const vasqLogger *logger, VASQ_CONTEXT_DECL, void *ptr, size_t size)
  *
  * @return The same return value as fork.
  */
-pid_t __attribute__((deprecated)) vasqFork(const vasqLogger *logger, VASQ_CONTEXT_DECL);
+pid_t
+vasqFork(const vasqLogger *logger, VASQ_CONTEXT_DECL)
+#ifdef __GNUC__
+    __attribute__((deprecated))
+#endif
+    ;
 
 /**
  * @brief Wrap vasqFork by automatically supplying the file name, function name, and line number.
@@ -397,8 +423,12 @@ pid_t __attribute__((deprecated)) vasqFork(const vasqLogger *logger, VASQ_CONTEX
  * @param value The value passed to exit/_exit.
  * @param quick If true, _exit is called.  Otherwise, exit is called.
  */
-void __attribute__((deprecated)) vasqExit(vasqLogger *logger, VASQ_CONTEXT_DECL, int value, bool quick)
-    __attribute__((noreturn));
+void
+vasqExit(vasqLogger *logger, VASQ_CONTEXT_DECL, int value, bool quick)
+#ifdef __GNUC__
+    __attribute__((noreturn)) __attribute__((deprecated))
+#endif
+    ;
 
 /**
  * @brief Wrap vasqExit by automatically supplying the file name, function name, and line number and setting
diff --git a/include/vasq/safe_snprintf.h b/include/vasq/safe_snprintf.h
index fdf60d8..ac8f750 100644
--- a/include/vasq/safe_snprintf.h
+++ b/include/vasq/safe_snprintf.h
@@ -25,7 +25,11 @@
  * buffer or format is NULL or if size is 0, then -1 is returned.
  */
 ssize_t
-vasqSafeSnprintf(char *buffer, size_t size, const char *format, ...);
+vasqSafeSnprintf(char *buffer, size_t size, const char *format, ...)
+#ifdef __GNUC__
+    __attribute__((format(printf, 3, 4)))
+#endif
+    ;
 
 /**
  * @brief Same as vasqSafeSnprintf but takes a va_list instead of variable arguments.
@@ -49,7 +53,11 @@ vasqSafeVsnprintf(char *buffer, size_t size, const char *format, va_list args);
  * @return Same as for vasqSafeSnprintf.
  */
 ssize_t
-vasqIncSnprintf(char **output, size_t *capacity, const char *format, ...);
+vasqIncSnprintf(char **output, size_t *capacity, const char *format, ...)
+#ifdef __GNUC__
+    __attribute__((format(printf, 3, 4)))
+#endif
+    ;
 
 /**
  * @brief Same as vasqIncSnprintf but takes a va_list instead of variable arguments.
diff --git a/source/logger.c b/source/logger.c
index cc7bc3e..15e8bbe 100644
--- a/source/logger.c
+++ b/source/logger.c
@@ -118,8 +118,8 @@ vlogToBuffer(const vasqLogger *logger, vasqLogLevel_t level, VASQ_CONTEXT_DECL,
 
         if (c == '%') {
             switch (logger->format[++k]) {
-                unsigned int padding_length;
-                size_t len, idx;
+                unsigned int padding_length, len;
+                size_t idx;
                 char time_string[30], padding[LOG_LEVEL_NAME_MAX_PADDING + 1];
 
             case 'M': vasqIncVsnprintf(dst, remaining, format, args); break;
@@ -438,7 +438,8 @@ vasqHexDump(const vasqLogger *logger, VASQ_CONTEXT_DECL, const char *name, const
     char output[VASQ_LOGGING_LENGTH + HEXDUMP_BUFFER_SIZE];
     char *dst = output;
     int remote_errno;
-    size_t actual_dump_size, remaining = sizeof(output);
+    unsigned int actual_dump_size;
+    size_t remaining = sizeof(output);
     vasqLogLevel_t dump_level;
 
     if (!logger) {
@@ -455,7 +456,7 @@ vasqHexDump(const vasqLogger *logger, VASQ_CONTEXT_DECL, const char *name, const
                 "%s (%zu byte%s):", name, size, (size == 1) ? "" : "s");
 
     actual_dump_size = MIN(size, VASQ_HEXDUMP_SIZE);
-    for (size_t k = 0; k < actual_dump_size; k += VASQ_HEXDUMP_WIDTH) {
+    for (unsigned int k = 0; k < actual_dump_size; k += VASQ_HEXDUMP_WIDTH) {
         unsigned int line_length;
         char print_buffer[VASQ_HEXDUMP_WIDTH];