diff --git a/Makefile b/Makefile
index ace6f9c..9bc53bb 100644
--- a/Makefile
+++ b/Makefile
@@ -10,8 +10,8 @@
 include project.cfg
 
 # Compiler flags
-CFLAGSFX := $(CFLAGS) $(CFLAGS_FX) $(INCLUDE)
-CFLAGSCG := $(CFLAGS) $(CFLAGS_CG) $(INCLUDE)
+CFLAGSFX = $(CFLAGS) $(CFLAGS_FX) $(INCLUDE_FX)
+CFLAGSCG = $(CFLAGS) $(CFLAGS_CG) $(INCLUDE_CG)
 
 # Linker flags
 LDFLAGSFX := $(LDFLAGS) $(LDFLAGS_FX)
@@ -40,6 +40,12 @@ endif
 FXCONVFX := --fx --toolchain=$(TOOLCHAIN_FX)
 FXCONVCG := --cg --toolchain=$(TOOLCHAIN_CG)
 
+# Determine the compiler install and include path
+GCC_BASE_FX := $(shell $(TOOLCHAIN_FX)-gcc --print-search-dirs | grep install | sed 's/install: //')
+GCC_BASE_CG := $(shell $(TOOLCHAIN_CG)-gcc --print-search-dirs | grep install | sed 's/install: //')
+GCC_INCLUDE_FX := $(GCC_BASE_FX)/include
+GCC_INCLUDE_CG := $(GCC_BASE_CG)/include
+
 #
 #  File listings
 #
@@ -128,10 +134,10 @@ build-cg/%.s.o: %.s
 # Preprocessed assembler sources
 build-fx/%.S.o: %.S
 	@ mkdir -p $(dir $@)
-	$(TOOLCHAIN_FX)-gcc -c $< -o $@ $(INCLUDE) -Wa,--dsp
+	$(TOOLCHAIN_FX)-gcc -c $< -o $@ $(INCLUDE_FX) -Wa,--dsp
 build-cg/%.S.o: %.S
 	@ mkdir -p $(dir $@)
-	$(TOOLCHAIN_CG)-gcc -c $< -o $@ $(INCLUDE) -Wa,--dsp
+	$(TOOLCHAIN_CG)-gcc -c $< -o $@ $(INCLUDE_CG) -Wa,--dsp
 
 # Images
 build-fx/assets/img/%.o: assets-fx/img/%
diff --git a/include/gintctl/libs.h b/include/gintctl/libs.h
index a7babae..0ce0bff 100644
--- a/include/gintctl/libs.h
+++ b/include/gintctl/libs.h
@@ -14,6 +14,9 @@ void gintctl_libs_printf(void);
 /* gintctl_libs_memory(): Core memory functions */
 void gintctl_libs_memory(void);
 
+/* gintctl_libs_openlibm(): OpenLibm floating-point functions */
+void gintctl_libs_openlibm(void);
+
 /* gintctl_libs_libimg(): libimg-based rendering and image transform */
 void gintctl_libs_libimg(void);
 
diff --git a/project.cfg b/project.cfg
index e289705..8f31e8a 100644
--- a/project.cfg
+++ b/project.cfg
@@ -55,14 +55,17 @@ CFLAGS_CG := -D FXCG50  -m4-nofpu
 CFLAGS += -Wall -Wextra -Os
 
 # Include paths. Add one -I option for each folder from which you want to
-# be able to include files with #include<>.
-INCLUDE := -I include
+# be able to include files with #include<>. The Makefile provides a variable
+# GCC_INCLUDE_FX/GCC_INCLUDE_CG that represents the default include folder,
+# which is useful for some libraries such as OpenLibm.
+INCLUDE_FX = -I include -I $(GCC_INCLUDE_FX)/openlibm
+INCLUDE_CG = -I include -I $(GCC_INCLUDE_CG)/openlibm
 
 # Libraries. Add one -l option for each library you are using, and also
 # suitable -L options if you have library files in custom folders. To use
 # fxlib, add libfx.a to the project directory and use "-L . -lfx".
-LIBS_FX := -lprof -limg-fx
-LIBS_CG := -lprof -limg-cg
+LIBS_FX := -lprof -limg-fx -lopenlibm
+LIBS_CG := -lprof -limg-cg -lopenlibm
 
 # Base linker flags for the fxSDK, you usually want to keep these.
 LDFLAGS_FX := -T fx9860g.ld -lgint-fx $(LIBS_FX) -lgint-fx -lgcc
diff --git a/src/gintctl.c b/src/gintctl.c
index 83c3c68..163808d 100644
--- a/src/gintctl.c
+++ b/src/gintctl.c
@@ -85,6 +85,8 @@ struct menu menu_libs = {
 		gintctl_libs_printf },
 	{ "libc: " _("mem functions", "Core memory functions"),
 		gintctl_libs_memory },
+	{ "libm: " _("OpenLibm", "OpenLibm floating-point functions"),
+		gintctl_libs_openlibm },
 	{ "libimg" _("",": Image transforms"),
 		gintctl_libs_libimg },
 	{ NULL, NULL },
diff --git a/src/libs/openlibm.c b/src/libs/openlibm.c
new file mode 100644
index 0000000..bd92b14
--- /dev/null
+++ b/src/libs/openlibm.c
@@ -0,0 +1,64 @@
+#include <gint/display.h>
+#include <gint/keyboard.h>
+
+#include <gintctl/libs.h>
+#include <gintctl/plot.h>
+
+#define __BSD_VISIBLE 1
+#include <openlibm/openlibm.h>
+
+/* gintctl_libs_openlibm(): OpenLibm floating-point functions */
+void gintctl_libs_openlibm(void)
+{
+	/* Sine curve magnified 1000 times because plot() only uses ints */
+	int32_t x[128], y[128];
+
+	for(int i = 0; i < 128; i++)
+	{
+		x[i] = 1000 * i * M_PI / 20;
+		y[i] = 1000 * sin(i * M_PI / 20);
+	}
+
+	dclear(C_WHITE);
+
+	#ifdef FXCG50
+	row_title("OpenLibm floating-point functions");
+	row_print(1, 1, "Basic sine curve:");
+
+	struct plot plotspec = {
+		.area = {
+			.x = 20, .w = 354,
+			.y = 40, .h = 80,
+		},
+		.data_x = x,
+		.data_y = y,
+		.data_len = 128,
+		.color = C_RED,
+
+		.ticks_x = {
+			.multiples = 785, /* pi/4 */
+			.subtick_divisions = 4,
+			.format = "",
+		},
+		.ticks_y = {
+			.multiples = 250, /* 0.25 */
+			.subtick_divisions = 2,
+			.format = "",
+		},
+
+		.grid = {
+			.level = PLOT_FULLGRID,
+			.primary_color = C_RGB(20, 20, 20),
+			.secondary_color = C_RGB(28, 28, 28),
+			.dotted = 1,
+		},
+	};
+	plot(&plotspec);
+
+	row_print(8, 1, "exp(1.0) = %.8j", (int)(1e8*exp(1.0)));
+	row_print(9, 1, "atan(1.0)*4 = %.8j", (int)(1e8*4*atan(1.0)));
+	#endif
+
+	dupdate();
+	while(getkey().key != KEY_EXIT) {}
+}