diff --git a/Makefile b/Makefile
index 4ab0b3e..9675166 100644
--- a/Makefile
+++ b/Makefile
@@ -25,9 +25,16 @@ CFLAGS = -Wall -Wextra \
 	 -L./dep/lib/${OS} -L/usr/lib -L/usr/local/lib -L/usr/X11R6/lib \
 	 -I/usr/X11R6/include/freetype2 -I/usr/local/include/freetype2
 
-LDFLAGS = -lc -lX11 -lXft -lsys
-SLIB = -lxcb -lthr -lfontconfig -lfreetype -lXrender -lXau -lXdmcp -lexpat -lintl \
-       -lbz2 -lpng16 -lbrotlidec -lz -lm -lbrotlicommon
+LDFLAGS = -lc -lX11 -lXft
+.if ${UNAME_S} == "FreeBSD"
+LDFLAGS += -lsys
+.endif
+.if ${UNAME_S} == "FreeBSD"
+SLIB += -lxcb -lthr -lfontconfig -lfreetype -lXrender -lXau -lXdmcp -lexpat -lintl \
+        -lbz2 -lpng16 -lbrotlidec -lz -lm -lbrotlicommon
+.elif ${UNAME_S} == "OpenBSD"
+SLIB += -lxcb -lpthread -lfontconfig -lz -lexpat -lfreetype -lXrender -lXau -lXdmcp
+.endif
 
 all: debug
 
diff --git a/main.c b/main.c
index f7f20ef..93eca57 100644
--- a/main.c
+++ b/main.c
@@ -110,7 +110,11 @@ int main() {
   int w = attr.width;
 
   {
+#if defined(__OpenBSD__)
+    ui.resLabel.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-48");
+#elif defined(__FreeBSD__)
     ui.resLabel.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-72");
+#endif
     if (!ui.resLabel.font) {
       cleanup(&ui);
       fprintf(stderr, "解決フォントの読み込みに失敗。\n");
@@ -131,7 +135,11 @@ int main() {
     if (!XftColorAllocName(ui.display,
         DefaultVisual(ui.display, DefaultScreen(ui.display)),
         DefaultColormap(ui.display, DefaultScreen(ui.display)),
+#if defined(__OpenBSD__)
+        "#f1ed25", &ui.resLabel.fg_color)) {
+#elif defined(__FreeBSD__)
         "#ee4030", &ui.resLabel.fg_color)) {
+#endif
       cleanup(&ui);
       fprintf(stderr, "色の役割に失敗。\n");
       exit(1);
@@ -139,7 +147,11 @@ int main() {
   }
 
   {
+#if defined(__OpenBSD__)
+    ui.problemLabel.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-12");
+#elif defined(__FreeBSD__)
     ui.problemLabel.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-24");
+#endif
     if (!ui.problemLabel.font) {
       cleanup(&ui);
       fprintf(stderr, "問題フォントの読み込みに失敗。\n");
@@ -159,21 +171,33 @@ int main() {
     if (!XftColorAllocName(ui.display,
         DefaultVisual(ui.display, DefaultScreen(ui.display)),
         DefaultColormap(ui.display, DefaultScreen(ui.display)),
+#if defined(__OpenBSD__)
+        "#b8b515", &ui.problemLabel.fg_color)) {
+#elif defined(__FreeBSD__)
         "#b61729", &ui.problemLabel.fg_color)) {
+#endif
       cleanup(&ui);
       fprintf(stderr, "色の役割に失敗。\n");
       exit(1);
     }
   }
 
+#if defined(__OpenBSD__)
+  ui.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-8");
+#elif defined(__FreeBSD__)
   ui.font = XftFontOpenName(ui.display, screen, "Noto Sans CJK-12");
+#endif
   if (!ui.font) {
     cleanup(&ui);
     fprintf(stderr, "フォントの読み込みに失敗。\n");
     exit(1);
   }
 
+#if defined(__OpenBSD__)
+  if (!XftColorAllocName(ui.display, &ui.visual, ui.colormap, "#232320", &ui.color)) {
+#elif defined(__FreeBSD__)
   if (!XftColorAllocName(ui.display, &ui.visual, ui.colormap, "#232020", &ui.color)) {
+#endif
     cleanup(&ui);
     fprintf(stderr, "色の役割に失敗。\n");
     exit(1);
diff --git a/scrot1.png b/scrot1.png
index 6200fd8..7a2727b 100644
Binary files a/scrot1.png and b/scrot1.png differ
diff --git a/scrot2.png b/scrot2.png
index 18860f7..a1cded5 100644
Binary files a/scrot2.png and b/scrot2.png differ
diff --git a/src/control.c b/src/control.c
index 1086b6c..20aec58 100644
--- a/src/control.c
+++ b/src/control.c
@@ -215,7 +215,11 @@ void control_expose(UiSystem *ui, XEvent *e) {
     XftColorAllocName(ui->display,
       DefaultVisual(ui->display, DefaultScreen(ui->display)),
       DefaultColormap(ui->display, DefaultScreen(ui->display)),
+#if defined(__OpenBSD__)
+      "#232320", &buttonColor);
+#elif defined(__FreeBSD__)
       "#232020", &buttonColor);
+#endif
   }
   initialized = 1;
 
diff --git a/src/ui.h b/src/ui.h
index 5af4f56..38f355b 100644
--- a/src/ui.h
+++ b/src/ui.h
@@ -4,10 +4,17 @@
 #include <X11/Xft/Xft.h>
 
 #define FGCOL 0xfcfcfc
+#if defined(__OpenBSD__)
+#define BGCOL 0x232320
+#define BTSEL 0xb8b515
+#define BTCOL 0xf1ed25
+#define BTHVR 0xecea71
+#elif defined(__OpenBSD__)
 #define BGCOL 0x232020
 #define BTSEL 0xb61729
 #define BTCOL 0xee4030
 #define BTHVR 0xf35869
+#endif
 
 typedef struct {
   int x, y, width, height;