diff --git a/c/allergies/GNUmakefile b/c/allergies/GNUmakefile
new file mode 100644
index 0000000..adf038d
--- /dev/null
+++ b/c/allergies/GNUmakefile
@@ -0,0 +1,51 @@
+# The original 'makefile' has a flaw:
+# 1) it overrides CFLAGS
+# 2) it does not pass extra "FLAGS" to $(CC) that could come from environment
+#
+# It means :
+# - we need to edit 'makefile' for different builds (DEBUG, etc...), which is
+#   not practical at all.
+# - Also, it does not allow to run all tests without editing the test source
+#   code.
+#
+# To use this makefile (GNU make only):
+#   "make": build with all predefined tests (without editing test source code)
+#   "make debugall": build with all predefined tests and debug code
+#   "make mem": perform memcheck with all tests enabled
+#   "make unit": build standalone (unit) test
+#   "make debug": build standalone test with debugging code
+#
+# Original 'makefile' targets can be used (test, memcheck, clean, ...)
+
+.PHONY: default all mem unit debug std debugtest
+
+default: all
+
+# default is to build with all predefined tests
+BUILD := teststall
+
+include makefile
+
+all: CFLAGS+=-DTESTALL
+all: clean test
+
+debugall: CFLAGS+=-DDEBUG
+debugall: all
+
+debugtest: CFLAGS+=-DDEBUG
+debugtest: test
+
+mem: CFLAGS+=-DTESTALL
+mem: clean memcheck
+
+unit: CFLAGS+=-DUNIT_TEST
+unit: clean std
+
+debug: CFLAGS+=-DUNIT_TEST -DDEBUG
+debug: clean std
+
+debugtest: CFLAGS+=-DDEBUG
+debugtest: test
+
+std: src/*.c src/*.h
+	$(CC) $(CFLAGS) src/*.c -o tests.out  $(LIBS)
diff --git a/c/allergies/README.md b/c/allergies/README.md
new file mode 100644
index 0000000..6c3ec99
--- /dev/null
+++ b/c/allergies/README.md
@@ -0,0 +1,68 @@
+# Allergies
+
+Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
+
+An allergy test produces a single numeric score which contains the
+information about all the allergies the person has (that they were
+tested for).
+
+The list of items (and their value) that were tested are:
+
+* eggs (1)
+* peanuts (2)
+* shellfish (4)
+* strawberries (8)
+* tomatoes (16)
+* chocolate (32)
+* pollen (64)
+* cats (128)
+
+So if Tom is allergic to peanuts and chocolate, he gets a score of 34.
+
+Now, given just that score of 34, your program should be able to say:
+
+- Whether Tom is allergic to any one of those allergens listed above.
+- All the allergens Tom is allergic to.
+
+Note: a given score may include allergens **not** listed above (i.e.
+allergens that score 256, 512, 1024, etc.).  Your program should
+ignore those components of the score.  For example, if the allergy
+score is 257, your program should only report the eggs (1) allergy.
+
+## Getting Started
+
+Make sure you have read the "Guides" section of the
+[C track][c-track] on the Exercism site. This covers
+the basic information on setting up the development environment expected
+by the exercises.
+
+## Passing the Tests
+
+Get the first test compiling, linking and passing by following the [three
+rules of test-driven development][3-tdd-rules].
+
+The included makefile can be used to create and run the tests using the `test`
+task.
+
+    make test
+
+Create just the functions you need to satisfy any compiler errors and get the
+test to fail. Then write just enough code to get the test to pass. Once you've
+done that, move onto the next test.
+
+As you progress through the tests, take the time to refactor your
+implementation for readability and expressiveness and then go on to the next
+test.
+
+Try to use standard C99 facilities in preference to writing your own
+low-level algorithms or facilities by hand.
+
+## Source
+
+Jumpstart Lab Warm-up [http://jumpstartlab.com](http://jumpstartlab.com)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+
+[c-track]: https://exercism.io/my/tracks/c
+[3-tdd-rules]: http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
diff --git a/c/allergies/makefile b/c/allergies/makefile
new file mode 100644
index 0000000..f34535a
--- /dev/null
+++ b/c/allergies/makefile
@@ -0,0 +1,37 @@
+### If you wish to use extra libraries (math.h for instance),
+### add their flags here (-lm in our case) in the "LIBS" variable.
+
+LIBS = -lm
+
+###
+CFLAGS  = -std=c99
+CFLAGS += -g
+CFLAGS += -Wall
+CFLAGS += -Wextra
+CFLAGS += -pedantic
+CFLAGS += -Werror
+CFLAGS += -Wmissing-declarations
+CFLAGS += -DUNITY_SUPPORT_64
+
+ASANFLAGS  = -fsanitize=address
+ASANFLAGS += -fno-common
+ASANFLAGS += -fno-omit-frame-pointer
+
+.PHONY: test
+test: tests.out
+	@./tests.out
+
+.PHONY: memcheck
+memcheck: test/*.c src/*.c src/*.h
+	@echo Compiling $@
+	@$(CC) $(ASANFLAGS) $(CFLAGS) src/*.c test/vendor/unity.c test/*.c -o memcheck.out $(LIBS)
+	@./memcheck.out
+	@echo "Memory check passed"
+
+.PHONY: clean
+clean:
+	rm -rf *.o *.out *.out.dSYM
+
+tests.out: test/*.c src/*.c src/*.h
+	@echo Compiling $@
+	@$(CC) $(CFLAGS) src/*.c test/vendor/unity.c test/*.c -o tests.out $(LIBS)
diff --git a/c/allergies/src/allergies.c b/c/allergies/src/allergies.c
new file mode 100644
index 0000000..9a879ae
--- /dev/null
+++ b/c/allergies/src/allergies.c
@@ -0,0 +1,18 @@
+#include "allergies.h"
+
+bool is_allergic_to(const allergen_t all, const uint32_t val)
+{
+    return !!(val & (1 << all));
+}
+
+allergen_list_t get_allergens(uint32_t val)
+{
+    allergen_list_t list = { .count = 0 };
+    allergen_t i;
+
+    for (i=0; i<ALLERGEN_COUNT; ++i) {
+        list.allergens[i] = is_allergic_to(i, val);
+        list.count += list.allergens[i];
+    }
+    return list;
+}
diff --git a/c/allergies/src/allergies.h b/c/allergies/src/allergies.h
new file mode 100644
index 0000000..bb42ebb
--- /dev/null
+++ b/c/allergies/src/allergies.h
@@ -0,0 +1,42 @@
+#ifndef ALLERGIES_H
+#define ALLERGIES_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef enum {
+   ALLERGEN_EGGS = 0,
+   ALLERGEN_PEANUTS,
+   ALLERGEN_SHELLFISH,
+   ALLERGEN_STRAWBERRIES,
+   ALLERGEN_TOMATOES,
+   ALLERGEN_CHOCOLATE,
+   ALLERGEN_POLLEN,
+   ALLERGEN_CATS,
+   ALLERGEN_COUNT,
+} allergen_t;
+
+typedef struct {
+   int count;
+   bool allergens[ALLERGEN_COUNT];
+} allergen_list_t;
+
+// We could use macro...
+// #define is_allergic_to(allerg, val) (!!((val) & (1 << (allerg))))
+bool is_allergic_to(const allergen_t allergen, const uint32_t value);
+allergen_list_t get_allergens(uint32_t value);
+
+/* See GNUmakefile below for explanation
+ * https://github.com/braoult/exercism/blob/master/c/templates/GNUmakefile
+ */
+#if defined UNIT_TEST || defined DEBUG
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+#ifdef  TESTALL
+#undef  TEST_IGNORE
+#define TEST_IGNORE() {}
+#endif
+
+#endif