diff --git a/config.mk b/config.mk
index e69de29..6bf181a 100644
--- a/config.mk
+++ b/config.mk
@@ -0,0 +1,12 @@
+PREFIX     ?= /usr/local
+bindir      = $(DESTDIR)$(PREFIX)/bin
+includedir  = $(DESTDIR)$(PREFIX)/include
+libdir      = $(DESTDIR)$(PREFIX)/lib
+sharedir    = $(DESTDIR)$(PREFIX)/share
+mandir      = $(sharedir)/man
+docdir      = $(sharedir)/doc/libepoch
+# We need an `echo` program that doesn't screw with terminal escape sequences.
+# This only matters if /bin/sh is a symlink to dash, as the echo builtin in dash
+# will screw with them and pass them as printed characters.
+ECHO        = /bin/echo
+
diff --git a/datetime.c b/datetime.c
index 8e3909b..0ad6114 100644
--- a/datetime.c
+++ b/datetime.c
@@ -32,7 +32,6 @@
 
 #include "epoch.h"
 #include <stdint.h>
-#include <stdio.h>
 #include <time.h>
 
 int32_t dateTimeGetYear(DateTime *self) {
@@ -84,68 +83,69 @@ Weekday dateTimeGetWeekday(DateTime *self) {
     return ts % 7;
 }
 
-void dateTimeFromTimestampParts(int64_t seconds, int64_t nanoseconds, DateTime *dt) {
+void dateTimeFromTimestampParts(DateTime *self, int64_t seconds, int64_t nanoseconds) {
     int     ret = 0;
     
-    dt->nanoseconds = nanoseconds;
-    dt->zone.tag = UTC;
+    self->nanoseconds = nanoseconds;
+    self->zone.tag = UTC;
     if (seconds < 0) {
-        yearNew(&dt->year, 1969);
-        while (seconds < yearGetSeconds(&dt->year)) {
-            seconds += yearGetSeconds(&dt->year);
-            yearDecrement(&dt->year);
+        yearNew(&self->year, 1969);
+        while (seconds < yearGetSeconds(&self->year)) {
+            seconds += yearGetSeconds(&self->year);
+            yearDecrement(&self->year);
         }
-        dt->month = December;
+        self->month = December;
         while (ret == 0) {
-            if (-seconds < monthGetSeconds(dt->month, &dt->year)) break;
-            seconds += monthGetSeconds(dt->month, &dt->year);
-            ret = monthDecrement(&dt->month);
+            if (-seconds < monthGetSeconds(self->month, &self->year)) break;
+            seconds += monthGetSeconds(self->month, &self->year);
+            ret = monthDecrement(&self->month);
         }
         ret = 0;
-        dt->day = monthGetDays(dt->month, &dt->year);
-        while (dt->day > 0 && seconds < -SECONDS_PER_DAY) {
+        self->day = monthGetDays(self->month, &self->year);
+        while (self->day > 0 && seconds < -SECONDS_PER_DAY) {
             seconds += SECONDS_PER_DAY;
-            dt->day -=1;
+            self->day -=1;
         }
-        dt->hour = 23;
-        while (dt->hour > 0 && seconds < -SECONDS_PER_HOUR) {
+        self->hour = 23;
+        while (self->hour > 0 && seconds < -SECONDS_PER_HOUR) {
             seconds += SECONDS_PER_HOUR;
-            dt->hour -= 1;
+            self->hour -= 1;
         }
-        dt->minute = 59;
-        while (dt->minute > 0 && seconds < -60) {
+        self->minute = 59;
+        while (self->minute > 0 && seconds < -60) {
             seconds += 60;
-            dt->minute -= 1;
+            self->minute -= 1;
         }
-        dt->second = seconds + 60;
+        self->second = seconds + 60;
     } else if (seconds > 0) {
-        yearNew(&dt->year, 1970);
-        while (yearGetSeconds(&dt->year) < seconds) {
-            seconds -= yearGetSeconds(&dt->year);
-            yearIncrement(&dt->year);
+        yearNew(&self->year, 1970);
+        while (yearGetSeconds(&self->year) < seconds) {
+            seconds -= yearGetSeconds(&self->year);
+            yearIncrement(&self->year);
         }
-        dt->month = January;
-        while (ret == 0 && monthGetSeconds(dt->month, &dt->year) < seconds) {
-            seconds -= (int64_t)monthGetSeconds(dt->month, &dt->year);
-            ret = monthIncrement(&dt->month);
+        self->month = January;
+        while (ret == 0 && monthGetSeconds(self->month, &self->year) < seconds) {
+            seconds -= (int64_t)monthGetSeconds(self->month, &self->year);
+            ret = monthIncrement(&self->month);
         }
-        dt->day = seconds / SECONDS_PER_DAY + 1;
+        self->day = seconds / SECONDS_PER_DAY + 1;
         seconds %= SECONDS_PER_DAY;
-        dt->hour = seconds / SECONDS_PER_HOUR;
+        self->hour = seconds / SECONDS_PER_HOUR;
         seconds %= SECONDS_PER_HOUR;
-        dt->minute = seconds / 60;
+        self->minute = seconds / 60;
         seconds %= 60;
-        dt->second = seconds;
+        self->second = seconds;
     } else {
-        yearNew(&dt->year, 1970);
-        dt->month = January;
-        dt->day = 1;
-        dt->hour = 0;
-        dt->minute = 0;
-        dt->second = 0;
+        yearNew(&self->year, 1970);
+        self->month = January;
+        self->day = 1;
+        self->hour = 0;
+        self->minute = 0;
+        self->second = 0;
     }
 }
 
 void dateTimeFromTimespec(DateTime *self, struct timespec *ts) {
-    dateTimeFromTimestampParts(ts->tv_sec, ts->tv_nsec, self);
+    dateTimeFromTimestampParts(self, ts->tv_sec, ts->tv_nsec);
 }
+
diff --git a/include/epoch.h b/include/epoch.h
index bbee84a..2cdb400 100644
--- a/include/epoch.h
+++ b/include/epoch.h
@@ -146,8 +146,8 @@ int64_t     dateTimeGetTimestampNaive   (DateTime *self);
 int64_t     dateTimeGetTimestamp        (DateTime *self);
 void        dateTimeGetTimespec         (DateTime *self, struct timespec *ts);
 Weekday     dateTimeGetWeekday          (DateTime *self);
-void        dateTimeFromTimestampParts  (int64_t seconds, int64_t nanoseconds,
-                                         DateTime *dt);
+void        dateTimeFromTimestampParts  (DateTime *self, int64_t seconds,
+                                         int64_t nanoseconds);
 void        dateTimeFromTimespec        (DateTime *self, struct timespec *ts);
 
 #endif // !LIBEPOCH_H