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diff --git a/include/haproxy/cfgcond-t.h b/include/haproxy/cfgcond-t.h
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+++ b/include/haproxy/cfgcond-t.h
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+/*
+ * include/haproxy/cfgcond-t.h
+ * Types for the configuration condition preprocessor
+ *
+ * Copyright (C) 2000-2021 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef _HAPROXY_CFGCOND_T_H
+#define _HAPROXY_CFGCOND_T_H
+
+#include <haproxy/api-t.h>
+
+/* nested if/elif/else/endif block states */
+enum nested_cond_state {
+	NESTED_COND_IF_TAKE,      // "if" with a true condition
+	NESTED_COND_IF_DROP,      // "if" with a false condition
+	NESTED_COND_IF_SKIP,      // "if" masked by an outer false condition
+
+	NESTED_COND_ELIF_TAKE,    // "elif" with a true condition from a false one
+	NESTED_COND_ELIF_DROP,    // "elif" with a false condition from a false one
+	NESTED_COND_ELIF_SKIP,    // "elif" masked by an outer false condition or a previously taken if
+
+	NESTED_COND_ELSE_TAKE,    // taken "else" after an if false condition
+	NESTED_COND_ELSE_DROP,    // "else" masked by outer false condition or an if true condition
+};
+
+/* 100 levels of nested conditions should already be sufficient */
+#define MAXNESTEDCONDS 100
+
+/* supported conditional predicates for .if/.elif */
+enum cond_predicate {
+	CFG_PRED_NONE,                   // none
+	CFG_PRED_DEFINED,                // "defined"
+	CFG_PRED_FEATURE,                // "feature"
+	CFG_PRED_STREQ,                  // "streq"
+	CFG_PRED_STRNEQ,                 // "strneq"
+	CFG_PRED_STRSTR,                 // "strstr"
+	CFG_PRED_VERSION_ATLEAST,        // "version_atleast"
+	CFG_PRED_VERSION_BEFORE,         // "version_before"
+	CFG_PRED_OSSL_VERSION_ATLEAST,   // "openssl_version_atleast"
+	CFG_PRED_OSSL_VERSION_BEFORE,    // "openssl_version_before"
+	CFG_PRED_SSLLIB_NAME_STARTSWITH, // "ssllib_name_startswith"
+	CFG_PRED_ENABLED,                // "enabled"
+};
+
+/* types for condition terms */
+enum cfg_cond_term_type {
+	CCTT_NONE = 0,
+	CCTT_FALSE,
+	CCTT_TRUE,
+	CCTT_PRED,
+	CCTT_PAREN, // '(' EXPR ')'
+};
+
+/* keyword for a condition predicate */
+struct cond_pred_kw {
+	const char *word;         // NULL marks the end of the list
+	enum cond_predicate prd;  // one of the CFG_PRED_* above
+	uint64_t arg_mask;        // mask of supported arguments (strings only)
+};
+
+/* condition term */
+struct cfg_cond_term {
+	enum cfg_cond_term_type type; // CCTT_*
+	struct arg *args;             // arguments for predicates
+	int neg;                      // 0: direct result; 1: negate
+	union {
+		const struct cond_pred_kw *pred; // predicate (function)
+		struct cfg_cond_expr *expr;      // expression for CCTT_PAREN
+	};
+};
+
+/* condition sub-expression for an AND:
+ *   expr_and = <term> '&&' <expr_and>
+ *            | <term>
+ */
+struct cfg_cond_and {
+	struct cfg_cond_term *left;
+	struct cfg_cond_and *right; // may be NULL
+};
+
+/* condition expression:
+ *   expr = <expr_and> '||' <expr>
+ *        | <expr_and>
+ */
+struct cfg_cond_expr {
+	struct cfg_cond_and *left;
+	struct cfg_cond_expr *right; // may be NULL
+};
+
+#endif /* _HAPROXY_CFGCOND_T_H */